We stayed at the studio over the busy Easter period. Location is great, most attractions are walking (15-30 mins). Easy to reach from Marco Polo airport (we took the public boat and it took us just over an hour). It's a flat walk from the water boat stop to the studio (crossing a couple of bridges with ramps), which was great help with luggage. Check-in was smooth overall.
The studio is quite compact, being on the ground floor and with only a window to the small back space, we didn't get much sunlight into the studio, which was ok with us as we didn't stay in apartment during the day. WiFi was reliable. The bed was large and comfortable. Marilia provides basic breakfast ingredients and plastic cups/plates/cutleries for the guests. She was prompt to replenish them on our request. There is a supermarket less than 5 mins walk from the studio, open till late evening. There are number of local cafes and restaurants near by. Marilia was kind to secure heating for us as it got chilly dropped due to rain (Italian law doesn't allow heating normally after mid-Apr).
We were asked for our id proof while check-in and Marilia took a copy on her phone, which took us by surprise as we are fully verified by airbnb (and has never been asked so in many years of using airbnb) - happy to oblige either way. Marilia allowed us to leave our luggage in the apartment after check-out, it was helpful as we had a flight in the afternoon. One thing to note that it is expected to leave the luggage in the hallway just outside the studio but inside the main building, something which we were not comfortable with and agreed with Marilia to leave our luggage just inside the studio (she did mention it was perfectly safe to do so, our cautious minds didn't agree!)
Overall, we would recommend Marilia's studio for a short trip.