We didn't meet Vincenzo, but he was very responsive to text messages and he initiated text conversations to see how we were getting on. We were checked in and out of the apartment by his business associate Salvatore who is a really nice guy and very helpful, suggesting local restaurants and offering driven car tours of the local area.
The apartment is amazingly grand and exactly as pictured. It is very convenient for the ferries to Capri, Ischia and Procida; the funicular to Vomera; Metro stations; one of the main shopping streets (Via Toledo); and more than walkable to the historical centre.
I am a very light sleeper, and some nights were disrupted by noise from the piazza, which is to be expected; however, it was no way as bad as other experience I've had in busy cities and if I had chosen to wear earplugs then I would have had a good sleep every night. It would not put me off staying again.