I spend eight days at Matthias’s place and it is a really good place to stay in, specially for the price you pay. I enjoyed the silence and the bed was comfortable (not suitable for big guys, it is 180 cm). The shower worked very well. The kitchen is really nice and Matthias take care of everything I needed.
I will add that kitchen can not always be used (not when there are classes) and sometimes the bathroom is shared by those attending the classes. Matthias gives advice of that in the instructions of the Airbnb.
Definitely I would recommend it.