Loved staying at Louis's place. He is an incredibly responsive host and check-in is super easy with a lockbox any time you get there. The apartment is in THE BEST AREA, we ate at all the restaurants nearby and walked almost everywhere. It's also close to 3 different metros so getting anywhere was super easy. It was a great apartment as well with all of the amenities (even a great computer monitor to do work on!) and I would absolutely stay there again when I come back to Berlin.