The apartment was great and in a perfect location. Definitely the best place we've stayed in Rome so far! It's very close to all the main attractions (less than a 10 minute walk to the colosseum) and Termini station (direct train to and from the airport), but also very close to some very nice bars and restaurants in Monti. We only used the metro once as we could easily walk to everywhere we wanted from the apartment.
It is small and cosy and was the perfect size for two of us. I think it would be a bit of a tight squeeze for more than two people! Maria Teresa was very helpful and everything about our stay was perfect!