We stayed at the Visconti Suite for 3 nights and it was a very good experience. Alessia was very helpful from the beginning, promptly answering questions before I booked, and sending us useful links about sightseeing in Rome.
When we arrived, she was well prepared so we could complete the paperwork quickly. The building is in a quiet neighborhood 15 minutes walk from the Vatican, and close to buses and the Metro. The suite is in a historic building with tall ceilings, marble steps, and the elevator had an iron gate (cool!). There were lawyers' offices throughout the building, so it was quiet and respectful.
The room itself was spacious for two, and the bathroom was clean and water pressure was good.
Next time I'm in Rome I'll definitely stay with Visconti Suite again.