My wife, parents and I stayed for 2 nights in Rome at Gabriella's apartment this July. The place is fairly close to the Roma termini but not easily accessible by public transportation so we just took a cab. Gabriella was kind enough to check us in a couple of hours early, she herself was not present but her friend met us at the property and gave us the keys. There was a small note about an extra fee towards city tax (which goes directly to the city and not the host, just be aware of it). The neighborhood and the apt building seemed safe and secure, in fact you need a key to both get in and out of the main building. There is an elevator too inside, which helps when you have heavy luggage to get to this apt on the 3rd floor.
The apartment itself is exactly as depicted in the listing, extremely clean with great interior decoration and very cute!! The kitchen was spacious too with a nice breakfast/dinner table for 4, she also left us some welcome candy :) We were satisfied with all the amenities and there is a standing/rotating floor fan in each of the two bedrooms. The weather this July, however, was extremely hot and unforgiving so perhaps the host should consider installing ceiling fans for better air circulation and window A/C units if possible (for an extra fee - this would be a great addition for the hot summers). The bathroom was clean and well-maintained as well, my one minor complaint is about the drain in the shower, the water never drained properly, it was super slow (may be previously clogged but was not fixed).
If you are planning to use a bus to get to the Pantheon, Colosseum etc.. I must warn you about the route 71, which is extremely infrequent and unpredictable. On several occasions we ended up taking cabs after a 1 hour (futile) wait. The metro system is pretty good BUT the trains are super crowded with a high risk of pickpocketing. The apt location otherwise is pretty good - there are nice cafes/restaurants around, a park nearby and markets if you would like to buy fresh veggies and fruit for a reasonably cheap price.
Although she wasn't there in person she constantly communicated with us via messages. She was very accommodating when we needed to store our luggage for a few hours after the check-out. Overall, we really enjoyed our stay at Gabriella's apartment.