My girlfriend and I stayed at the flat for a few nights at the end of May. We hoped to see Berlin, get a feel for the culture, see the historic sights, and do it all without spending too much money or time on transit. The apartment was very nice, clean, and easy to get to from transit. It's close to a lot of nice areas and you can easily get around the city, without being right in a busy part of town - essentially a good home base. Alan and Kasia were very easy to get ahold of, flexible when we were late getting in from the airport, and made the whole process very easy. Definitely recommend the flat and would stay again.