Maria Beatrice and Carlo's house is a great place for a group vacation. I highly recommend it.
The location is super convenient and beautiful: very close to public transportation, restaurants, attractions; lively and yet not noisy or overcrowded.
The furniture and equipment of the house is not exactly luxurious, but definitely beyond merely comfortable. There is a lot a care for details and a pleasant funky design!
We found the place perfectly clean and Carlo was professional in his interaction with me (both at check-in and in replying to a couple texts promptly and kindly).
The only thing that would make a stay at their place even better (at least for certain groups) would be the option of having one set of keys for each guest. We were a group of 7 adults and I was the only one with internet service on the phone. Having to coordinate movements was a little of a burden. Since Maria Beatrice and Carlo immediately agreed to give me 3 sets (instead of the 2 that they normally give their guests) I regret not having tried to ask for 7 sets. I know that making the copies would be a significant expense since they have a security door, but I would have been happy to leave a deposit for the sake of having more freedom of movement.
All in all I was very satisfied and I would definitely stay at Maria Beatrice and Carlo's place again!