We had a fantastic time staying at Alan & Kasia's place. The location is great- very close to local train and tram stops for quick and easy access to Mitte (the centre of Berlin), as well as to a local Aldi (for those breakfast supplies). We did many of the activities suggested in the tips from Alan & Kasia -we highly recommend the Sandemans walking tours which were extremely informative with some very knowledgable guides. Food wise, we loved Umami (a great indochinese restaurant) that was again recommended by Alan & Kasia. The only very slight negatives to our experience were hearing a few ambulances go past at night (which you would hear in any building in that area) and a gurgling noise coming from the bathroom drain very occasionally. Overall, we would definitely recommend staying at Alan & Kasia's place.