Martina's apartment is situated in a great location to walk to the Vatican City, and to other tourist attractions if you want to explore with your feet! If you can't walk too far, the metro is less than five minutes away and is very easy to use. There are many places to eat nearby but not too many that cater for Coeliacs. For me, we had to walk a bit further but it wasn't a problem.
As for the apartment, it's a great, clean space, with a view of St. Peter's dome. Martina is great at communicating, and Gabriela (Martina's friend) was truly lovely when she greeted us. You really couldn't ask for more for a city break in Rome!