It's almost unfair to rate the Hotel Mimosa because it does a lot of things right...it's in an AMAZING location steps from the Pantheon, it is clean, and the best deal in the neighborhood. We spent a week in Umbria and a week in Florence and stayed only for one night as we were flying out of Rome. I don't think I would have stayed more than a night or two anyway because the "family" room we had was too basic, three beds pushed together on one side and one cot on the other side was too dorm/hostel in which case one would look for a hostel, which I suspect would be cheaper than $155 Euro.
Under the same circumstances; short stay, wanting to be centrally located, I would do it again, but any longer than a night or two, for the same price or less, I would rent two rooms in a pensione, where the personal charms of the rooms are usually greater, the service more personal and you might get a little more of a regular neighborhood feel.
BUT, while still not a rave, the Hotel Mimosa, was clean, and central and I would give it a "conditional" thumbs up for budget travelers with basic expectations.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC