We want to rent an apartment for 3 days in Vienna. Found a great website with many options, but need help on picking a district. Ideally, we would like to be in residential neighborhood close to an U-bahn station. We like to stroll around to local shops and restaurants, but also want to get to the city center within 15-20 minutes on public transportation.
Which of the 23 districts would you recommend ? Are there any we should avoid?
Also, several apartments make mention of bus and/or tram stops. Are buses and trams good for getting around? Do they come frequently? Run at night? Move quickly through the city? etc.