Not recommended for long-term rental.
We had communicated two times more than 1,5 months in advance that we needed two keys, and they still managed not to have two sets of keys ready for my flatmate and I at check-in. It took a week before we could get an extra key which caused a lot of trouble as we worked independently. Furthermore, we asked to get a few things fixed and get extra linens as they only supplied one set each for a two-month stay, which we didn't get. This meant that when washing our beddings, they would still be wet in the evening because of the humidity.
We inquired about having a cleaning of the apartment and changing the beddings. "Warmrental" who is managing the apartment came back with a ridiculous price for cleaning of 70 euros + 30 for linen change. Eventually, they offered a free cleaning, but it was so sloppy.
The apartment requires maintenance: door handles that fall off in the bathroom, loose buttons, loose cabinet drawers, and doors that can barely close.