Guido was very helpful in every way - he arranged a taxi for us from the airport, and met us at the apartment to introduce us to the place.
The apartment is in a quiet hillside apartment complex above Trastevere - a welcome refuge after the many hours of walking we did in Rome. A local open-air market as well as excellent panneteria (bakery) is near-by, with a playground and neighborhood bustle that makes you feel like you are living in the "real" Rome, apart from the tourist areas.
The apartment is a small one bedroom, neat and clean, with accommodations for stove-top cooking (no oven). The bathroom is small but serviceable. There's even a small washing machine, which was very nice to have since we stayed there for two weeks.
I would definitely recommend Guido's apartment when visiting Rome. We had a great stay.