We stayed there last May and it was an excellent choice. It's a boutique hotel adjacent to the Pantheon. I got the best price by booking on its web site (pre-pay).

In addition to being next to the Pantheon, there's lots of site within walking distance: Bascilica of Santa Maria Sopra Minerva (only gothic church in Rome), the Piazza Navona, etc.

The piazza in front of the Pantheon is lovely at night. There are restaurants there or on the side streets so it's convenient after a day of touring.

You can get a taxi to the airport at the Pantheon. We had the hotel arrange a car and it didn't cost much more than a taxi.