Starting with the positive aspects, the location is great, as the flat is located in a local and active neighborhood, at a walking distance to Trastevere, Colosseo and city center.
Moving to the cons, despite being furnished with all the needed amenities, the place needs a renovation from its 60s style. The place is dark as it doesn't get sunlight and gets very hot in the summer (There is no air conditioning, but only a couple of fans). Also, there is no phone signal, so, WiFi or not, don't expect to be working remotely from here.
Good for a couple of days if you need a bed, not recommended for long stays.