Lela's apartment is located on a quiet street, but it's a stone's throw away from the metro (U-bahn) and from a bus station. It's in district 1 of Vienna, so all things a tourist would deem as must-sees are 15-20 minutes away by metro. Vienna is a beautiful city, and not as tourist-packed as Rome or Paris, and thank god for it.
We did not get to meet Lela personally, but she left very specific instructions on how to check-in and out. Unfortunately, someone threw out the instructions that she said she had left in the apt on how to use her washing machine cum dryer, so I had to google like crazy to understand what the machine's settings were. Thankfully, she had also prepared a clothes hanger for her guests to use, because whichever dryer setting I used, our clothes would only be partially dry. Her kitchen was stocked well, too, minus some cooking oil, but we managed. The one major caveat we had was that the wifi did not always work, which made entertaining ourselves while at home difficult since the TV also did not work (Lela said there were supposed to be 2 remote controls, but we saw only 1, which, upon pressing all the buttons, still did not turn on the TV that Lela said only had Austrian channels). If we did not have an alternative wifi source, we would have been doomed because our travel plans were all from the Internet. All that aside, this was still one of the best places we've stayed so far (location was great, house was clean, washer was a god-send, and the elevator doubly so), and I'd still recommend it to anyone coming to Vienna. Just have a plan B for your wifi source, if you rely on it heavily for your travel plans.