I stayed in this hotel for 6 nights during the world championships of athletics and i also spent a lot of time visiting the city of berlin so i only was in the hotel to sleep and have breakfast
my single bedroom had all the comfort i needed (good bed, spacy closet, tv which had sometimes problems finding the channels though, desk and bathroom with good shower but a sometimes refusing to do the job toilet)
a bit ennoying was the ventilation system that was on, and making some noise, between 6 in the morning and 11 o'clock in the evening (so bring earplugs)
the walls aren't very thick either so sometimes you could here your neighbours
there isn't, as far as i'm concerned, an internet connection possible but i don't have a laptop so couldn't try either
there are plenty of other (cheap or even free) possibilities to go on the net in berlin so don't worry
location is superb, just about 200m away from a bus stop (from airport tegel) and the s-bahn, same for the... more