Had a wonderful time in Guillaume's apartment - spacious, light, clean and comfortable. It's just a short walk from one of the U-Bahn (underground, subway) stations. A morning coffee and pastry in the nearby The Little Dot Cafe is highly recommended, and in the evening the whole area becomes alive with lovely small cafes and restauants/bars. Getting into the centre of Berlin is easy either by walking or U-Bahn.
Guillaume was a great host as everything was in place before I arrived, and there was only a slight hicup with the keys upon depature which got sorted out in the end.
If you're looking for a good apatment in a bustling and lively area, I'd highly recommend this one.
Thanks Guillaume!