The loft at Campo de' Fiori was a great place! Had hotel like amenities (soaps, shampoos, coffee, etc.) and cleanliness which was unexpected - also, Andrea met us when we arrived in the morning and was able to hold our luggage, which was very convenient.
The loft is very cute and comfy and the top (3rd) floor space has great views of Campo de' Fiori and the bed was very comfortable!
Some things to keep in mind - door to bathroom is just a window so if staying with just a friend or something (who I guess you would be comfortable sharing bed with), you will not get a lot of privacy in bathroom. Also, it does not have a lot of extra living space, and you are also right on the piazza so may hear some noise (we heard a stag party singing at bar below but it was a Friday night and only added to the charm).
Would recommend to anyone though and stay again if we ever made it back!