We had booked a double room for 3 nights but on arrival were told that that "we would have to change rooms in the morning to a different room"... when questioned the receptionist explained that we would stay the first night in a room with 4 single beds, then move the next day to a double room. As we had booked overa month prior we asked that we have a double room that night also, but she advised that there were none. I advised that we had a booking that was confirmed etc. She explained that bookings come in a ll the time and that the hotel did its best to provide requested rooms etc and was quite pleasant about it.
I said that we would cancel the booking as we realy wanted a double room and we had a confirmed booking for a double, also i wasnt happy about packing our bags the next morning again so they could move our room.
Again the receptionist was pleasant about and it agreed it wasnt good, she even offered to sign a piece of paper on which I had written that we were cancelling due to the lack of a double room.
There didnt appear to be anything she could do for us so we left and went to the Best Western just down the road which was very good.
I guess its summer in Europe and eveyone is busy but it was annoying even with substaintial notice and a confirmed booking we couldnt get the room we had paid for.

Hotel Atrium (ex Artim) Charlottenburg is located about 20 minutes away from the center of Berlin, with both the S-bahn (Charlottenburg station) and the U-bahn (Wilmersdorfer station) within easy reach, as well as the handy 109 bus (taking you to and from Tegel airport) station located right in front of the hotel. While the area may be further away from popular tourist attractions, you do have the advantage of being closer than most to the Charlottenburg Palace and gardens, as well as to the Berlin Zoo (best part of our trip, so make sure not to miss it!), and the trip to the airport only takes 20 minutes.
The area is quiet, but by no means isolated from the rest of the city, and there are many restaurants around, ranging from Turkish, Italian or international cuisine to the traditional currywurst stand that can satisfy your craving for a bite to eat for only 1-2 Euros.
There is also a nice little Asian supermarket across the street where you can get your grocery shopping done or try some Asian brand products instead of the stuff you’d usually buy.
The hotel was clean and quiet and the staff was polite, although we didn’t get a chance to interact that much, however the room was quite small. As soon as I opened the door to the room, I was immediately greeted by the bed, and the bathroom door had to be closed at all times since it would hit the room door otherwise. But these are only minor details that really made little to no difference after our first day of staying there.
Breakfast is served between 7 – 10 a.m. Monday to Friday and between 8 – 11 a.m. Saturday to Sunday, and the food is alright. They serve an open buffet stocked with beverages such as juice, tea, coffee and milk, several types of bread and bread rolls, yoghurts, fruit compote, fresh cucumber and pickles, cereal, biscuits, butter/margarine, jam, honey, chocolate-hazelnut spread, cream cheese and one type of hard cheese, various types of eggs (hard boiled, omelette, etc.), meatballs and fried ham and many types of cold cuts. The largest part of the buffet is occupied by meat-based products (Germans seem to be very fond of them) and they serve the exact same type of food every day which, for someone planning on a longer stay (we stayed for 9 days), might prove a bit dull. I should also point out they only had a couple of fresh fruits on one or two occasions, so I’m not sure their menu would suit vegetarians or people who are not that fond of meat for breakfast, but all in all, it was ok.
If your pockets aren’t loaded and your guidebook only suggests places for shopping in the price range of KaDeWe and the like (read: big designer brand names and outrageous prices), make sure you head for the Wilmersdorfer U-bahn station, as a shopping district is located about 10 minutes from the hotel, hosting some VERY interesting outlet-type shops (you can easily spend more than one hour in one of them that is quite huge and you’ll get some big designer names for bargain prices), as well as regular fast food places and all the rest.
My only warning about the hotel is that they are sticklers when it comes to the check-in/check-out time, so if you’re going to arrive there early, do not even dream about seeing the inside of your room before 2 p.m. However, they will let you store your luggage for free so you can go explore the city until you can officially be handed the card-key to your room.

Apart from the breakfast, which is generous and tasty, I would give everything else a miss.
Receptionists who aren't very friendly or helpful.
Location is very far away from central Berlin.
No fridge, tea or coffee making facilities in room.
Pillow SO bad I woke up with neck pains every day.