This was a very easy and very pleasant stay. The flat is in an excellent position very close to Friedrichstrasse (near Checkpoint Charlie) which makes it very convenient. It's an unusual flat in that you get into it from the courtyard rather than the staircase but that was not an issue from me. Inside it is decorated and furnished very modernly and very well, and the key features for me - shower, wifi, fridge - are all excellent. Lorenzo and his wife were very helpful and responded to all my messages straight away.