We had a pleasant stay at this apartment. It's basic decorated, but it is in a nice neighbourhood near a station and at walking distance from Alexanderplatz. We were with 6 persons but for that amount of people to really stay there I think it is too small. Because 2 people then have to sleep in the living room, and you only have te kitchen to sit in.
We were out all the time, so for us it was no problem.
There is a train station nearby and you can here a little traffic so bring your earplugs....