This apartment is an excellent value and is as described.
It is about a 45-min train ride to the colosseum (and most of the major attractions are in that same area which is convenient) and it only costs 1,50€ per trip. The apartment is a short 5 min walk from the ocean, which is lovely. The train station is only a 5 minute walk from the apartment, but pro tip: if you won’t have data on your phone, do save detailed directions to be apartment on your phone for your first walk there as the streets in the area are not well marked (especially tricky at night) and we got hopelessly lost the first time we tried to walk there. :) The neighborhood was quiet and seemed very safe.
Federica was an excellent host - extremely helpful over WhatsApp to answer any questions we had and she sent us awesome instructions.
The apartment is indeed very tiny but for my friend and I who only needed it as a place to sleep for the weekend (out sightseeing all day every day), it was great.
Quick note: it is damp in the apartment and probably wouldn’t be suitable for a person with dust or mold allergies (there is a heater to turn on that dries it out but we found it made it too hot).
Overall, it was an excellent home base with great value for our Rome explorations and we would recommend! Thanks Federica!