The appartement is really convenient situated 5 min from the Metro station at Monti district where many cool restaurants, bars and vintage shops around. Many famous places are walking distance. Despite the huge delay of my flight, Simone was flexible and kindly changed check-in time and all communication was smooth.
It is as like photos and description and there is all I needed.
He asked me to sign the contract as well as sending the photo of my ID.
Just one concern is that his neighbors were very noisy until quite late and I could not sleep until 3am. Obviously I don't know about other days. Hopefully it was only exception and it might be better to bring ear plugs.