The location, right next to the Pantheon piazza, was perfect for a walking-based Rome experience – we didn't use, or need to use, public transport to get anywhere we wanted to see in the five days we were there. Trevi Fountain, Piazza Navona, Spanish Steps, Forum, Vatican - all easily walkable from here. Not quite so easy to get to from Termini trailing luggage, but this was a very minor point for us. Valeriano and the building porter, Oliviero, made us feel very welcome indeed.
I strongly recommend them and this apartment for a short break in Rome, if you are no more than three in number (one double bedroom, one single, both with ensuite bathrooms)