The apartment was very clean, situated in a quiet neighborhood which is very nice (after eg a night out in Tresor/Berghain). The WiFi worked well and was fast. The heating also worked well. The beds were okay but if you're heavier it could be a bit less comfortable I suppose. We slept well though. The metro (U-bahn Turmstrasse, U9) is really nearby and takes you everywhere you want in no time. The communication went really smooth so we were really satisfied overall.
Enjoyed our stay in Berlin a lot.
Thanks Gilad and Kelly