We stayed a whole month. It was a hot July, and the apartment was an ideal place to rest and recover. The AC works perfectly, and even without it the place remains cool. Despite being located directly over Campo di Fiori, it is wonderfully quiet. If one closes the balcony, one should be able to sleep all day long.
Although the apartment is small, it is well distributed, has generous closet space, and very tall ceilings. The bed is comfortable, and the bathroom is fine too; it is tiny, but with great water pressure.
It was a great plus to have a very functional washing/drying machine. The kitchen was well equipped, and the internet was very good.
The location is truly great. It was nice to have plenty of bakeries to buy bread in the morning, nice cafes, and the wonderful market that opens daily.
One thing that is not related to the apartment, but might be relevant to know, is that the main entrance is between two restaurants. If you are a woman, you might get the constant and annoying flirting of some of the waiters on your way in and out. Nothing dangerous, but very tiresome.