Staying in Martin's flat was a pleasure for my girlfriend and I. The flat itself was cosy, very clean, well equipped and perfect for our needs (We cooked one night and ate out the other two). We were able to walk into the heart of the city or get the U-bahn quite easily from the station right next to the apartment block. Overall we had a fantastic weekend in Berlin which was facilitated all the more by having such great accommodation to come back to at the end of the day!