Ellis appartment is very nice, clean and everything you need is there. The appartment is not located in the crowded touristic centre but near U4 in between Heiligenstadt and Spittelau. With U4 you are very quickly within a few minutes in the centre. But at Spittelau you also can hire a bike (CityBikeWien = first hour free, second hour €1 etc.) and make a very nice cycling tour along the Donaucanal to the centre. At the Tourist Information you can get a free map with more save cycling routes, very nice to do!