I really enjoyed my stay at Sophia's ! I didn't get the chance to meet her but she made herself available when I needed and her roomate was both helpful and very nice. The neighbourhood is great : lively but also laid-back, popular and full of little cafés/joints. The appartement is near a lot of bike rentals, bus stops and a 10min walk from the nearest subway station. Since the appartement is on the 4th floor, the room (as well as the rest of the appartement) is quiet and bright. You can have breakfast enjoying the view over a lovely park ! Should I be back in Berlin, I'd surely love to stay again at Sophia's !