We were arriving very late by train from Frankfurt, the owner waited for us, let us in and even bought some food for us to survive the first night! Thank you, that was great!
The apartment was clean and tidy, all equipments were available as described on the net. The owner was available to us and he even showed us around Berlin, gave us tips on where to go and what to see - a nice and helpful person.
The apartment is a nice place, it is well-located if you want to travel with public transport (just 30 meteres away is the metro and you can go to any place in Berlin from there).
There are supermarkets and a nice Pizzeria just down the road. It is quiet and green.
On the last day, the owner told us that the next renters would not come and spontaneously suggested to us that we could stay one night longer - FOR FREE!
So, we stayed one more night.
We really enjoyed Berlin and could not believe that the owner was so kind to us! Absolutely recommendable!