If you are doubting about sharing a flat with someone - just don't, if this "someone" is Volker!
You won't even feel, that you have a neighbor and will never regret about this trip because:
Firstly, he is a great man, with amazing kindness and understanding. Volker is enjoyable conversationalist, but he will always respect your privacy and will let you be alone if you wish to.
He is doing everything for his guests to feel as comfortable as possible.
Secondly, the flat is perfect for that kind of living, as it has kitchen and a bathroom right in the middle, and the living rooms (Volker's and yours) on the opposite sides (like wings), so it's like living in a hotel. Also, you will have a big, warm and gorgeous loggia with a long dining table, so your area will be more like a two-room flat.
So! Stop thinking and go meet Volker, his pretty place, tasty tea and have some good time! <3