Vincenzo's apartment is very nice and clean, it looks like on the photos. It is even bigger, than I thought from the photos. The communication with Vincenzo and the check-in was smoothless.
Only two things that I missed are a microwave oven and an electric water boiler.
Termini is a good location in Rome, because you can get everywhere quickly. You just get off from the bus or the train and after few minutes walking you are in the apartment. Both metro lines are there close and you can reach all types of transportation near the Termini station. Many sights (including the Colosseum) are in walking distance. There are many luggage storages nearby as well. On the other hand it is a very dirty and noise part of Rome. I knew it when I booked the accommodation so it wasn't a problem for me. There is a tram line in the next street and I heard and felt the noise of every tram when I was lying in the bed. The windows and the walls are quite thin so you can hear every noise from the street and the neighbors.
In summary I'm satisfied with Vincenzo's apartment, I got what I expected and I would recommend it.