We stayed in Rome for a week with our 4 grown-up children and used both apartments. Note that there are only double beds available, so that might be a problem in some cases, not in ours, fortunately. Indeed the 3rd floor apartment is quite noisy at night and in the early morning (6.45-7.15) when the garbage collectors come around. However, the 2nd floor apartment has less of such problems as the windows open up to the opposite of the building. Expect an early morning call (7.30) by the same garbage collectors to open the door. The bathrooms are a bit Spartan and no soaps etc are provided for.
The price seems over the top (€ 90 pp) for such a studio, but one pays for the location, within 100m from the Campo de' Fiori and right in the epicentre of all of Rome's highlights in walking distance is a boon. There are hardly or no other hotels in the surroundings, but one may expect this to cange in the future.
I would search the next time for an alternative place close by, but if not available, I would happily settle down again.

We stayed in this studio right by the campo de fiori square for 2 nights and really enjoyed it. We were on the top floor and there is no elevator so you will have to carry your bags up 3 flights of stairs, but once you make the climb you will find a very comfortable studio suite. They have another studio one floor down which is very similar and nice as well. They allowed us to choose which we wanted as we showed up first, so we picked the upper suite because it was a little brighter, but the other studio was very nice as well. The shower is quite small which was not a problem for us, but might be for larger people. Everything was very clean. We really only used the fridge, but the kitchenette seemed to have everything you might need. No microwave but it did have a hot plate. The only downside to this suite is the noise at night. There is a restaurant right downstairs and it is very noisy at night. We used earplugs and had drinks with dinner everynight, so it was not too bad for us, but if you are a light sleeper, I would probably not recommend this studio. The location was excellent. We walked everywhere from the studio. The bus stop to the unit is probably a 5 - 10 minute walk.