We stayed at Martino's for 6 nights on the tail end of your 3 week Italian vacation. The apartment was lovely - clean, nicely decorated, and fit the bill for our family of 4. The nice touches such as coffee, sugar, assortment of cooking utensils, etc made the stay that much more enjoyable. The only thing I can think other travellers should know is that there isn't a living room. The apartment is made up of an eat in kitchen (seating for 4), bathroom, and two bedrooms. This fact didn't really matter much too us as we were out of the house exploring, but it may effect others.
Martino was very friendly, prompt to answer questions and was thorough in his meet & greet explanation of the apartment and surrounding areas. We had no issue with his level of English (especially since our Italian is dismal ;) )
We personally loved the location of the apartment, it's in the main area of residential apartments, about a 10 min walk to the town plaza which is just on the edge of the old quarter. We easily walked to a local playground, restaurants for dinner, harbour to go on a boat tour, and much more. Parking can be a bit tricky, you may have to loop the block a few times, but it's free and this is just the reality of staying in a city in Italy.
We'd definitely go back and recommend the place to others!