Maria's place is a charming studio set in a charming alleyway off of the Campo de Fiori, among the most famous and bustling open-air markets in Rome. It's within easy walking distance of prime sights (especially the Tiber and the Pantheon) and amazing restaurants. Another convenient factor is that if you don't remember directions, you can just tell your cab driver "Campo de Fiori" and be within steps of the place.
The hot tub was an outstanding way to round out the day after a long day of sightseeing. Travelers should be aware that there isn't a traditional shower in the place; rather, there's a shower nozzle on the deep tub. That wasn't a problem for us, though it's worth pointing out.