Robert's place is a gem! No other word, everything is stunning and extremely comfortable, whether you want to relax in a huge bedroom or enjoy the sunny terrasse with beautiful views. But the very best there is Robert himself: a very careful and sharing host, we had a lovely time discussing with him and could not have had a better wkd in Berlin.
Also, about the area, you're foosteps from Tiergarten, having a walk or a run there is the best way to start the day before coffee/bkfast in one of the nice places just next to the flat. Highly recommanded for a stay in Berlin!