We had a great time staying at Ahmed's apartment, and everything was very easy and convenient. The flat itself is clean and modern looking, and has pretty much everything you could need for a short stay in Vienna.
The location is also very good, as you are in walking distance of the Vienna Hauptbahnhof - this is very useful for traveling to and from the airport (the train only takes 15 mins), or for if you are travelling further to another location. The Favoriten area itself doesn't have that much to offer if you're a tourist, but it is very easy to get into the city centre using public transport (about 4 stops on the metro from nearby Reumannsplatz to Karlsplatz, near the Opera House, museum quarter and various other major sites).
Ahmed was very friendly and helpful, and was able to fit in with our travel plans in terms of check in time. I believe he speaks several different languages, and was happy to communicate with us in both German and English.