My girlfriend and I really enjoyed our time in Berlin at Alexanders place. It was a real highlight staying very close to the amazing public transport. Very easy to get from the apartment into the city on a train or tram, usually taking no more than 10-15 minutes. The apartment was nice, with plenty of space for us both. The amenities were good, meant we could bring our own beer home and put it fridge! Would recommend a stay here if you want private and user-friendly accomodation whilst in Berlin.