Guglielmo's Penthouse was absolutely amazing. The views from the private terrace were spectacular. The penthouse is located close enough to the city center that it's easily accessible but also far enough away to avoid the mass amounts of tour groups. It's in a quiet neighborhood with a very small town feel. This made us feel at home in a foreign country.
Guglielmo was a very kind host. He greeted us, in person, when we arrived and checked in (via Airbnb message) halfway through our stay to make sure that we our stay was as we expected. Guglielmo also took the time to go through tips about getting to the city center via local bus from his penthouse. He provided a written guide (in English and Italian) about how to take the bus to the city's center as well as some information about popular museums and sites. I would book another stay with Guglielmo in a heartbeat. We could not have found a better location or host!