My girlfriend and I had a great time in Vienna in Diana's place.
Communication with Diana was great, she replied quickly to all our questions, her answers were relevant and she speaks many languages (English, German, Albanian, a bit of French ...).
She arranged for her mother to welcome us on arrival (since she was at work) and gave us very good directions to get to her flat.
Diana is a great host, she offered us breakfast and drinks several times and gave us good tips about the city. We also had great conversations together.

The flat is well located in a quiet neighbourhood, outside the "Gurtel" (outer ring) but very close to public transport so it's really easy to get in and out of the city center (usually took us 20 to 35 minutes to get to the very center of the city) even late at night. If you are lazy, Uber is also a good solution and gets you home for less than 10 euros.
The room is as described, it's a small room in the appartement she shares with her mother and daughter, and we also have our own bathroom which is next door to the bedroom. Everything was very clean, bed sheets and towels were provided. It's not a double bed, it's two simple beds (one sliding underneath the other), but they are very comfortable.
Overall I really recommend Diana's place, unless you need a lot of privacy obviously and a lot of space (but then I guess one should book a whole flat).
For us it was perfect, a cosy place for the night (since we were out most of the day) and a nice contact with our host and her family.