Armin is a very professional and extremely accommodating host. Although we never met in person (he was away) he arranged for his friend to be available at the apartment to check me in & they were very flexible with the time to suit my schedule. The apartment is situated in the 12th district (I was originally in the first district) but having said that it is still very quick to get into the centre of town. The u-Bahnhof is a bit of a walk (but doable) but the tram is very close by. You can be in the centre of town in about 15 minutes, so very convenient indeed. The neighbourhood was fine and the apartment block was very quiet. The apartment is nicely decorated, very warm and the bed is extremely comfortable; I slept very well. I didn’t really use the kitchen but, although it’s very small, it has everything you need to cook a simple meal. The bathroom is good. Armin was also very flexible in regards to luggage storage and check out. I recommend 100% and I would certainly stay there again myself.