I stayed for two days at Kims and Romans flat and it was an absolutely amazing experience! Communication was perfect, and i had a very nice an warm welcome at the flat. It has a very clean, scandinavian stlye but is very cozy at the same time!
Location is perfectly right in the middle of Berlin, all shops, restaurants and bars are close. The main station is 10 mins by public transport.
I would highly recommend this place, as it is a perfect spot for a Berlin experience and Kim and Roman are extremly nice hosts!