We spent a long weekend in Munich to visit the many Christmas markets there.
We never actually met Volker in person but he gave us clear instructions as to how to access the apartment and what to do when we left.
The apartment was in a great location, easy to get to from the airport and within walking distance of almost everything.
It was fairly small but was good for what we needed (albeit a bit strange having his clothes and personal items everywhere!).
There are only 2 cons with this apartment - even though he knew there were 2 guests staying he only provided 1 full bath towel; and there was no wifi.