Perfect location! Easy to get to every part of Rome and most of it, including Colusseum, Pantheon, Trevi Fountain, Piazza Navona and Borghese Gallery/Museum, within a 25 minute walk. Jumping in a taxi round the corner at Piazza della Repubblica was a good option for us to get to the Vatican (€12) and to the Catacombs di Domitilla (€15) which are just a bit further away.
(TIP: We stayed mid-week and not peak season and there were no queues to any of the main attractions - don't believe the beat-the-queue ticket touts who will tell you the queues are 40 minutes).
Apartment was very clean, bedrooms are a good size, showers were nice and sofa bed was comfortable. Kitchen is kitted out with the basics. It all functioned very well for us as a base for exploring the city.
I love the building the apartment is in with its giant front doors and antique lifts - it has some real character. The views from your apartment windows aren't spectacular but of course the city just outside the front door is.
I would recommend this apartment.