The apartment is in a very old building (c. 1600), in an absolutely perfect location. 2 minute walk from Campo dei Fiori, 5 minutes from Piazza Navona, 5 minutes from Trastevere. All of the other major tourist attractions (Vatican, Colosseum, Piazza del Popolo...) are within easy 30-minute walking distance. There are many buses that pass close by to get to the Termini train station for day trips elsewhere.
Giuliana was very nice.
She provided coffee and packaged breakfast croissants for our 4-night stay.
The necessities provided (towels, toilet paper, blankets, bath gel, dishwashing detergent) were more than sufficient.
As you will have noted in the other comments, there are a few things to know before you come: it's a 5th-floor walkup with steep, uneven stairs (old building). There is no separation between the shower and the rest of the bathroom (sink, toilet), except for a shower curtain. So the whole bathroom floor gets wet when you shower. But there is a sort of elevated platform that you can put down after the shower so your feet don't get wet. This is typical of older Italian apartments. Also, the simple kitchen has a refridgerator, a microwave and a single gas burner for cooking.
There is a modern radiator in each room, so we were nice and warm. (This is NOT something you find in all older Italian apartments.)
Overall, the stay was excellent and exactly as described. Thank you, Giuliana.