I had great time in Vienna and staying at Jonas' the room was very spacious and private. Closest metro was within walking distance and it was easy to get food and shop for groceries.
Internet was quite bad, sometimes cut off completely. Sometimes you could hear neighbours being quite loud late into night. Other than that almost flawless stay. Privacy for working, nice room, clean, great shower and kitchen.
Jonas also offered free coffee and free use of laundry machine.
Overall I highly recommend a stay at Jonas' place.