Such a lovely experience. Beautiful, well-appointed flat. Cloud-like bed and super-soft sheets. Palatial room with original fixtures and lovely mid-century accent pieces. Consummate hosting (Cristina's boyfriend Vincent who was amazing and attentive even though he'd broken his arm on the day of my arrival!). Literal seconds from the U Bahn train stop and mere steps from vibrant Kreuzberg hot spots. Note that the room does face a busy street / the train but I never found it to be a problem (noise dampening exterior shades etc.) This place comes highly recommended and I'll sure try to come back when I swing through Berlin again.