The apartment is in a very old building, with high floors and no central heating system. In the summer, it must certainly be quite pleasant, but if it's 10°C outside, it's nearly impossible to warm up in the few hours that you will be staying there if you come for work or to visit the city during the day.
The kitchen is old and badly equipped. In general, the apartment equipment seems like it could benefit from a better design. Showering is like the wheel of fortune. Apparently it is highly dependent on the water pressure of the rest of the building, so if you try to shower at a peak time, you only have a few drops of water to shower with.
Only a few plugs available, so bring your own extension (and IT-EU-US plug converters) if you want to connect many devices.
It is challenging to find public parking space in the area. If you come by car, you can park it in a private, underground car park nearby. It might cost you between 12 and 24€/day to do so.
Apart from that, Valter was friendly and welcoming (except on the insistence about leaving before 10am, which was a written requirement anyway) and provided the necessary information for our stay.
Overall, we felt like the apartment was a little pricy in comparison with others closer to the city center and better equipped, but we had a good 3-days stay.