Ok, here is my story; it turns out that I was in Paris going to Munich, but by mistake I bought the Train ticket to another place (14 hours away from Matthias' place), so obviously I arrived several hours after the arranged time.
Matthias was so comprehensive and thoughtful with my problem, and he waited all that time for me to arrive to Munich, He was an awesome host.
Once in there, I was nicely welcomed, and received very good directions and recommendations for moving in the City and going to the Oktoberfest (my goal :-) )

The apartment was beautiful, so Clean, in a very Nice neighborhood, and very close to the Underground station.
I am very grateful to Matthias for all the help, I will definitively book it again when in Munich.