We really loved Edward's apartment in Berlin. We were a family of 9 and found it very clean, well equipped and spacious. There was even a fully automatic coffee machine, fully loaded with beans, ready to be used! It looked as if he had thought of every single detail to make our stay comfortable.
The space has been well optimised and it's conveniently located close to the centre and HB (15' by bus).
Beds are OK. You can sleep well but are not super-comfy.
I would definitely recommend Edwards apartment and I would rent it again without hesitation.