What to say about this place other than it is WONDERFUL. Literally a 2-minute walk from the Vatican square, less than 5 minutes from the Castel St-Angelo, and walking distance from Rome's other attractions (even the Colosseum, furthest away at a 40-minute walk), the apartment is perfectly located down a beautiful side-street - so somewhat secluded but easily accessible.
The apartment itself is lovely, beautifully decorated (we went around Halloween so there were some light-hearted spooky touches to the place which we loved) and fully stocked with everything you need (comfy bed, sheets, towels, even pots and pans if you want to cook rather than have a night out).
And then there's the host. Roberto is amazing, really quick to respond to enquiries and genuinely passionate that you enjoy your stay. On the first night he gave us a wonderful tip for a lovely little pizzeria with views of the Castel St-Angelo, and he even left us a bottle of wine as I was visiting with my girlfriend for our anniversary! Roberto's hospitality definitely improved our stay. Check-in and check-out are simple as well; Roberto was waiting in the apartment when we arrived to drop off the keys, and we simply had to leave the keys on the table when we left.
Overall, a wonderful apartment in a wonderful location with a wonderful host! Would absolutely stay here again. Did I say it was wonderful?