We really enjoyed our one week of stay in Marc's apt. The apt is modern, bright, and spacious (the photos definitely don't do its justice). It was a great base to explore Berlin for our family of 3 (2 adults + a baby). The neighborhood couldn't be better - tree lined streets lined with cute houses and filled with cafes, restaurants, and boutique shops. It made use feel like locals in Berlin rather than some tourists. Despite the complaints in other reviews about the check-in process, we find Jörg (who checked us in) quite friendly and helpful. The biggest issues we had with the apt were 1) its uncomfortable beds (like many other reviews have already mentioned); 2) the elevator only stops in between floors so we still had to lift our stroller through two long flights of stairs on both ends every time in and out of the apt. On the positive side, the apt has so many baby-friendly features which comes very handy if you are traveling with a young baby (portable crib, high chair, baby furniture, etc.). Our luggage missed the connecting flight on our arrival so the baby amenities in the apt really saved us!