Marco's place was wonderful for my mom and I. We stayed a week and used both beds - both very comfortable. Very beautiful decor, and has everything you need for your stay. When I arrived there was fresh ground coffee, wafers, fresh towels and toiletries in bathroom. Really feels like a luxury suite. You can tell Marco puts a lot of effort into making the flat clean, comfortable, and inviting for his guests.
Location is really great - Monti is a very charming neighborhood, quiet, not too crowded and very close to public transport (close to Cavour subway stop, buses, and Termini Station.)
Even though Marco was on holiday, he was very responsive during our stay. Both him and his father were available with any questions I had. Check out Marco's guidebook - very helpful.
Hope to meet you next time Marco!