I came to visit the historic center of Vienna, but got so much more with Andreas' helpfulness and the amenities the apartment provided.
1) The apartment building is historic, but the apartment is totally renovated and modern. The view out the kitchen window of the old church is lovely; the evening church bells are charming. Other than the bells you never hear any outside sounds/ street noise; the bedroom looks out on the inner courtyard; the large living room is insulated with triple pane Windows.
2) Public transit has many and varied choices; 3 tram lines, one at your doorstep, whisk you to the center to various locations on the Ring. The #2 tram even circles half the Ring. Subway is close by. Bus 10A takes you to Schoenbrunn.
3) But most surprising were the many interesting aspects of staying outside of the Center in Ottakring District. Here Andreas' helpfulness (fluent English and German) played a big role. In the same building, downstairs, the restaurant Ottakringer Stub'n offers excellent Viennese and Austrian cuisine. "10er Marie", Vienna's oldest Heuriger (wine bar/restaurant), is a block down the street. You don't have to go to Grinzing to enjoy this experience. Also close by are Ottakringer Brauerei (Vienna's last brewery), Gruenspan (a well-known Viennese beer garden), Cafe Huebler and a variety of grocery stores and other shops.
4) The only drawback to this fine apartment is that for some guests with handicaps it has no elevator.
Thank you Andreas and Ottakringer Stub'n.