I've just spent my second time at Ivo's and Ramona's place and they will be my first choice when going to Berlin next time!
the room is perfect even with it's own entrance so you don't disturb everybody every time you return to the flat.
I was there with two friends for a music festival so coming back in the night was even more comfortable with the seperate entrance.
both Ivo and Ramona are super nice and very helpful. like last year the stay at their place was perfect and there is absolutely nothing I could complain about. I can only suggest them to anybody who wants to have a great host in (the east of) berlin!