The location is very good, Anina is really nice and it is convenient that the check-in/out is in a hotel's reception on the same street. Moreover, the flat is big, and there is a very comfortable study/working area.
Please note that the church's bell makes some noise in the morning (so earplugs is a good idea), there is no lift and the stairs are small, so it is not convenient for a lot of luggage, the selling is pretty low and the kitchen is not suitable for cooking (there is a small fridge and a microwave, but no stove or oven).
Saying all that, I think it is a very good "value for money" option, especially for people coming for a short business trip.