Helmut's apartment is great! Super light and spacious with lots of quirky touches from his many travels. The tram and underground are easy to get to. There is also a good size Billa supermarket opening any day for supplies which is just down the road. Check in was easy as Medea (Helmut's daughter) met us at the property and talked us through everything.
I would like to say a special thank you to Medea for going above and beyond for us as a host. My husband left his phone in an Uber on our first night and the Uber driver was very unhelpful and unresponsive to us as non-German speakers but Medea was super persistent and hounded him until he return the phone to us! That is the sign of a super host!
It was a bit cold for us to use but the roof terrace will be amazing in the summer!
Absolutely recommend this apartment as a great base to explore Vienna.