The apartment is well located, clean (except for the rug in the lounge) and adequately equipped.
Eduardo is great to deal with, and even waited until after 9pm to meet us after a late flight.
The balcony is a lovely place to enjoy meals or drinks, although you continually have to duck to avoid the aircon fan. There are many good restaurants, small city supermarkets, taxi stand, and metro station all nearby as well as being easy walking distance to the Spanish steps and the Trevi Fountain. Towels and bedding are of very good quality with a comfortable bed.
There is nothing specifically wrong with the apartment, but the description of "luxury apartment" doesn't quite match expectations. The listing photos are accurate but there are small niggles that aren't obvious like having to unplug the fridge/freezer to use the microwave, and the tired looking kitchen. All in all, I would rate it 2-3 stars if it were a hotel.