My mother and her best friend spent 5 days in Lumis apartment and they loved it. The apartment is perfectly equipped (I should write that the bed is very comfortable :)), there was everything what they needed and it was also very quiet. They loved the locations, it is perfect for the sighseeing! The friend of my mom cannot walk much (problems with kniees), neverthless they never had to walk too much. Everything is close and nearby.
The contact with Lumi was great, it couldn't be better.
My mom and her friend are very thankful for everything. Thank you so much for letting them stay in the apartment. When they will plan to arrive to Vienna again, we will definitely check if your apartment is available in this period :)