Marco met us at the apartment with a friend who speaks English. They were very nice and patient about showing us everything in the apartment.
The apartment itself is very cute and clean, though a little dark in the front room. The rest of the apartment is sunny and bright. If it had been warmer, we would have made use of the exterior patio. We stayed in for dinner three nights and the apartment had everything we needed to cook a meal. The location is right in the heart of Trestevere and very close to the Ponte Siste bridge that takes you to all the tourist attractions in Rome.
As it's in the heart of Trestevere and on the ground floor, it was pretty noisy on Friday and Saturday night -- up to 3am. The other evenings were relatively quiet.
Marco was very responsive when we had questions during our stay. He was a very conscientious host.