What a stunning location! The views from the rooftop terrace are breathtaking. The location is close to the nightlife and bustle of Trastevere but on a quiet street so you don't get disturbed. Albina's husband met us at the apartment, and took the time to both show us round the apartment and give us some excellent suggestions for an itinerary to see all the main sights, and some gems we'd have totally missed without him. And Albina was excellent in keeping us informed prior to arriving, even ringing us when we landed in Rome, very reassuring for a first time visitor.
The only down sides to this apartment were that there are about 80 steps up to it so not suited to everyone (though if you've a cold beer in the fridge to aid recovery the views make up for it), and there is no left luggage facility at Trastevere station so with a morning checkout and a teatime flight you either carry cases all day or head into Termini and join the long queue to leave luggage for an hour or 2.
I'll be booking it again next time I come to Rome.