We stayed here in July and I have to say we were so happy with the apartment.
We booked via Homeaway, but contacted Patrick direct to query a few things, and he was fantastic! (We also took his recommendation of using a prebooked transfer. The driver also called ahead, so Patrick was there to greet us and hand over keys). Very welcoming.
The apartment is very well equipped, and surprisingly quiet for such an incredibly central spot. Within walking distance of Piazza Navona, Vatican etc. the last time I stayed in Rome, I paid a lot more and didn't have the facilities or peace that this apartment provided.
Cool, quiet and central - so perfect.