very conveniently located, walking distance to Technical University, Karlsplatz, Naschmarkt, Musikverein, and the opera. Tram 1 takes you all along Ringstraße and the WLB to the Meidling station.
The apartment is very clean and has wood floors. I can recommend it for people with dust allergy. It has a furnished kitchen that gets you through breakfast and dinner, although I recommend following your hosts advice and have breakfast at the coffee place close by.