I had a great stay at this apartment. It is very cozy and accomodating, as you are staying in an usually lived in apartment, rather than just a vacation apartment. Much as I would decorate my own home.
Contact with Juan was great, he made it possible for me to check in early and even check out later on my day of departure.
The area is great, lots of cafés around and many cool second hand shops close by.
I did get around vienna by local bike rental (offered by the public transportation system), which has a station right outside the apartment as well.
I would love to come back for another visit to vienna.