The flat is perfectly placed for seeing Berlin, and is a really nice space to hang out in in its own right. Werner has great taste - it's a big space with quirky and interesting books, art and furniture and a swing in the kitchen! It is non-conformist and all the better for it.
As for location, it is walkable to museum island and Checkpoint Charlie and on a really good bus route for the restaurants and bars of Kreuzberg. We had a packed weekend seeing many of Berlin's museums and galleries and eating very delicious food.
We were two families with three teenagers between us and the space was perfect for us all to share. The nespresso machine well supplied with capsules was very welcome as was Werner's fantastic milk frothing machine! Despite the high ceilings and chilly weather, it is a very warm flat with plenty of hot water for showers. We didn't meet Werner, but he made arrangements for our check in, which went very smoothly despite our plane being delayed. She was very accommodating about that, and met us a couple of hours later than planned without complaint. Thank you Werner.