We had an extremely lovely stay at Jeanette's place. It's so cosy and beautiful, clean and certainly big enough to host 4 people, comfy sofa bed (and bed).
She provided the basics for breakfast, and aside from that the kitchen really does have everything you need.
There is also lots of information, books and maps... The area is really nice. There are many restaurants and cafes nearby, and parties and clubs are never far away in Kreuzberg.
Overall fantastic experience!