I recommend Maria's place wholeheartedly. It's spacious, comfortable, clean and well looked-after. It's also very central - just 5 mins walk from the university of Vienna and also Schottentor. We arrived on a Saturday evening - she had thoughtfully provided us with some essential food provisions as shops are all shut on a Sunday. Thank you! The AC works well - but when we asked for a fan she also provided that. Maria was also very helpful and gave us very good tips about visiting Vienna. There are lovely places to eat nearby. The neighbourhood is very safe, clean and quiet - yet close to the main attractions. Thank you!