We really enjoyed our stay at Rainer’s place in Berlin. The apartment comfortably fit the 4 of us and is perfectly located a few minutes walk from Alexanderplatz station (great for travel around Berlin and transport to and from the airport/other train stations). (If you are in a group of 4 or more, it is probably worth getting a group day travel ticket.) The apartment is up just a few stairs - so was fine with our heavy bags. Rainer is just lovely and explained how to use the washing machine etc. and pointed out some places on a map which he gave us, which was very helpful. The apartment is really stylishly decorated and has everything you could need for your stay, so we really felt at home. The beds are comfy, the shower water pressure is great, and there is plenty of hot water. He thoughtfully provides umbrellas and plenty of tourist brochures. A massive supermarket is close by (Kaufland). Despite being close to a main station the street is nice and quiet and has some good restaurants nearby. We would definitely stay at Rainer’s again!