We stayed 6 nights at residenza Martin. Nycolas and Veronica are great hosts, very helpful and responsive, they live in a flat upstairs. On arrival, Nycolas took the time to point out some things on the map and give us some good tips (restaurants, places to go,...)
We stayed in the family suite, which was very spacious for us two, we didn't really use the second space with the sofa bed. It would be a great room to stay with 1 or 2 kids.
The room is on the street side, there's a market every day, so some noise. I had to use ear plugs but my wife just slept through it :-)
The room and the entire apartment were very clean, it's cleaned every day. There are three rooms, sharing two bathrooms, which is enough.
There is also a very practical kitchen, with everything you need to prepare a homemade breakfast or dinner. There's a great terrace next to the kitchen where you can enjoy your meal. Veronica also showed us how to make delicious cappuccino with the espresso machine :-)
The location of the apartment is perfect, close to the bus and train station and short walking distance to all important sights. We would definitely come back here!