I'm an older Canadian who has travelled and camped a lot, and this is my perspective.
Good aspects of apartment itself (aside from what's listed on posting): it's on ground floor; very secure entrance door; umbrella available; wifi strong; enough hot water; bed comfortable; reasonably quiet at night; lots of pots and pans and dishes etc.; no bugs or other surprises; clean enough for my needs; tap water tastes good and is safe; lots of books in different languages; adequate lighting once you figure out switches and outlets; host has made effort to decorate main room with an artistic eye, so it's a pleasant room to be in; there's a bidet, but as a North American I don't care.
Bad aspects of apartment itself: kitchen taps hard (but not impossible) to use; no coffee maker of any sort (in Italy?) but instant coffee in cupboard (in Italy?); electrical outlet system weird, such that we always had to wiggle Franken-adaptor system to charge electronic devices; toilet seat...well, it could have been worse; apartment dim in daytime because of security shutters on main room window; from main room you can hear what's going on in bathroom, sometimes in neighbour's; bathroom small with no shower stall, just shower head, curtain and drain in floor = soggy-edged bathmat. I'd prefer a real shower stall, or at least a containing rim on floor, and sacrifice the bidet if need be.
Good aspects of neighbourhood: only 12-minute walk from subway (metro) station (Ottaviano) on main line; it's an Italian residential and not a tourist area; friendly local people; only 10-minute walk from marvelous indoor market (Mercato Trionfale), a must-see; good, reasonably priced shops and restaurants nearby, and I recommend the Fiorentina (good food, friendly staff), just across street from Mercato Trionfale; within walking distance of Vatican and even Spanish Steps (I did it and I'm 72); safe, no hint of bad people; nearby pharmacist 'renewed' my prescription when I lost my pills, no hassle.
Bad aspects of neighbourhood: the cashier at the bakery just around the corner tried to short-change me 5 euros (I stood my ground).
All in all, this apartment is great value, and I doubt if I could get anything better for the same money so close to what you want to see and do in Rome.