Christo was super nice, friendly and helpful, and the flat was really cool and special (much better than in the photos). It's in an old and dusty building full of graffiti, and overall it's very bohemian and artsy, full of details and quirky antiques that give it a lot of character. It was absolutely perfect for me and I'd love to stay here again next time I visit Berlin, but if you're looking for a spotless, slick and impersonal hotel, it might not for you.