Me and my boyfriend stayed at David's apartment for 6 days. It was a pleasant stay and the apartment is just as seen on the pictures. The best thing about the apartment was its location. It's located 2 mins from a metro station with Vatican City also around 10 minutes away. As for other attractions they are around 20 - 30 minutes walk away.
The area is also very pleasant, with lots of cafes, supermarkets and restaurants nearby.
For those in Rome for an extended stay, I would also recommend taking a day trip out to Florence. Only an 1 hour 30 minutes away by train, Florence was just as nice as Rome.