We cannot recommend Patrick's apartment enough. It is elegant, spotlessly clean and extremely well appointed - from the espresso coffee-maker to the superbly comfortable bed. It is spacious and quiet, and the long climb up the stairs is well-rewarded. We found the loactaion admirable for getting to all parts of central Berlin on foot or by public transport and the local area has excellent amenities, supermarkets and places to eat.
Patrick and Kate were excellent hosts; they communicated clearly, provided valuable help and advice, made every effort to provide a good experience, were accommodating but left us to be totally independent during our stay.
A great place for a break in a fascinating and agreeable city.