You can't beat this location. A couple blocks from the Pantheon and Piazza Navona. A 15-minute walk to the Vatican. Great food and coffee within steps. A convenient taxi stand down the block.
The apartment itself is as advertised: compact, cute and unique. Be warned of the 4 flights of stairs (no elevator). You will also need to be able to climb a ladder to the bed loft. It was great for just me; 2 people and big luggage would be very tight.
Excellent communication before my arrival, which was late (there is a fee for arriving after 20:00).
I highly recommend this place.