Fantastic place. Not the cheapest, but certainly not the most expensive either. You get what you pay for, and more.
Location was great. Walking distance from Termini (main station), and most of the main sights in Rome. Two subway lines and a supermarket close by. The area itself is nice and quiet even though it's central.
Check-in was smooth. Downstairs is a note and phone number of the hosts. Just ring the buzzer and you're inside. Friendly welcome by the host family's father, he gave us some nice tips on to-dos and how-tos. Check-out was really flexible; we were allowed to keep our luggage there for later pick-up, because our flight was late.
The apartment itself is great; a loft in an ancient stone house, completely renovated and furnished. Second bathroom upstairs. Kitchen is well equipped and you can easily dine at home if you want to.
Highly recommended.