Costas' apartment is located just outside the city center, literally 1min from Reumannplatz Underground which connects you very quickly to the city center. There are plenty of places to eat around and the apartment has a certain charm because of the "old" style. The room is really spacious and the only thing I would suggest for improvement is the mattress, which is really hard, but that might be due to my preference for a soft mattress. Unfortunately we did not met Costas personally but we were welcomed by his friend Lea. I would recommend Costas' apartment if you are looking for a short city break to Vienna.