Had a really good time staying at Mathias' apartment. Location is very good, you can even reach the Altstadt on foot. The apartment is very well -lit and it felt so homey, as if we went into our own apartment.
Mathias as a host is very helpful, very easy to reach and to communicate and, even though we didn't have the chance to meet him in person, he gave us very detailed instructions to find the place, get the keys easily and settle to his place.
Will definitely try to stay to his place again, when back in Vienna