Me and two friends came to stay with Bee and Sam. The flat was gorgeous. The mezzanine is a little smaller than it looks on the pictures but it is still a lovely room. Sam and Bee were both very friendly and accommodating. The area is great and it's worth exploring Neukoln as well as all the normal site seeing places, we found some great vintage shops and places to eat (definitely try a kebab, they beat anything in the UK). Also, there is a german pub across the road from the flat which sells very authentic german food if you're craving stuff other than Lidl or the close by pizzerias/ Vietnamese food.
It's a great place to stay, would definitely recommend.