I've just returned from a 3 night stay here and came away disappointed.
The exterior of the building is beautiful and has some beautiful public areas. The interior architecture is odd, likely due to it's history as an office building, leading to disjointed spaces and poor room layout (e.g. TV unwatchable from either the bed or seating area). The one benefit is very high ceilings and large windows which lead to a light, spacious feeling. The rooms are generally comfortable with nice beds and furniture. I thought the towels felt cheap and threadbare, which is unacceptable for a five star property. Luxury should be the name of the game. The toiletries were Lanvin and were of a nice quality.
The service is poor overall. The entrance is up a long flight of stairs thus you'd expect, especially in a 5 star hotel, a bellman positioned at the bottom of the stairs. Not the case here so I got to lug our bags and kids up the stairs and into the lobby. Of all our trips in and out of the hotel during our four day stay, only once were we offered help up or down the stairs. There just don't seem to be enough bellmen on duty. Not five star service by any stretch of the imagination.
The housekeeping is atrocious. The first day our room was not made up at all. We returned to the hotel at 8pm, tired after a day of sightseeing and the room looked just as we left it. No clean dishes, no coffee for the morning, no clean towels, etc. I went to see the manager and they sent up housekeeping. Not much of a solution for a five star hotel. Other chains I've stayed with that do have true five star hotels would have been mortified.
The second day the room was made up but there were no clean dishes left for us, so again, I had to call down to have fresh cups, etc delivered. Disappointing.
I called down to the concierge on the 2nd morning to try to arrange tickets to Keukenhof via the package advertised on their website, due to the timing flexibility it offered. I was told that couldn't be done and I'd have to go with the company that the hotel used (and wait 2 hrs for the next departure). I just went to the business centre and booked it myself. I can't think of a time when I'd been told by a concierge I had to use a particular service for anything, anywhere. Sure a concierge will often recommend something but they've always got some flexibility if you desire another service. Not at the Amrath!
Loctionwise, the hotel is very handy to Central Station. If you are looking to visit things to the west side of the centre (Anne Frank house for example) it's a bit of a walk and if you are offended by the Red Light District you'll have to be alert to circumnavigate that.
For my situation, I'd look to stay a little more central next time to cut down walking a bit. We wandered into The Grand Sofitel while out exploring and it looks to be much more to my taste. A fountain in their entrance courtyard caught the eye of my toddler so we went over to look and a bellman came to greet us and he told us that they had a nice garden and maybe we'd like to have lunch there tomorrow so our child could play after we ate. That is how five star hotels are run, with attentive people who go out of their way to attend to your obvious needs, even if you are not resident at their property (next time we will be, thanks Sofitel).
I will not return to this hotel nor would I recommend it to others. There are better options for you money in Amsterdam.