I stayed in this apartment for three months -from June to September- and I really enjoyed my stay. The location is amazing, it is close to the canal, to the city center, to Prater (an amazing park to walk, bike or to have picnic). Also very close to the metro station. Besides, it is not on the main street, so it is far from the traffic and the neighbor is quiet. In two minutes you can walk to Prater street, where you can find many nice restaurants.
The apartment itself is cute and practical. Even though there is no air conditioning, I didn't have any problem with sleeping during the hottest days of July and August. (I didn't stay at home during the afternoons most of the time though so I don't know if it gets warmer then.)