We had a great time in Vienna. The location is a little further from the city center but very easy to hop on public transportation. There's a subway drop off, a bike rental dock right there, and highly recommend the hop on hop off if you are looking to cover a lot of ground in the city.
Harry was very sweet and answered the phone every time we contacted him with any questions we had!
The layout will comfortably sleep 7-8 but doesn't lend itself to very much privacy. We were traveling with my parents and family that wanted separate more private rooms because they weren't planning on staying out as late as us. As a result it wasn't ideal for us but might be for a large group of friends. Just to be a little more descriptive, you had to walk through other bedrooms to get to the bathroom, kitchen, etc.
The wifi only provides enough bandwidth for one person to connect.