my only complaints were:
1. I stayed for a month and they never cleaned the place. I had to ask for a new set of sheets, which they delivered. However, pillow cases were missing. I expected that they would clean the place from time to time and/or they will have extra sets of sheets etc stored in the apartment. I had to call all the time to ask stuff.
2. There was an issue with the balcony door. I called twice. They came twice. The problem was never really fixed.
Other than that, the place was decent in a convenient neighbourhood close to metro stations.