Peter hosted us personally, he sent text message throught SMS, Air Bnb as soon as I landed in VIE. His apartment is in the great location!! 3-5 min walking distance to many supermakets, only few stops of trams into old town, 3 min walks to Subway. Best thing is, his apartment got aircon, if you are here in summer, it is a lovely condition! Peter is easy to reach, and responds very fast. My mother and I really enjoyed the stay.