We had an extremely short stay at Lukas' place. The place is about 15 mins walk from the Wien Mitte station (from where the trains depart for the airport).
We reached late in the evening, around 10 PM, coincidentally Lukas had also reached home sometime back. He was there to receive us. He is a very friendly guy and we chatted for some time despite the hour.
The room was extremely spacious and could accommodate 5 people easily. The room and bathroom were clean.