I can only recommend Giuseppina's Minerva's Place:
1. A very good and central location, close (5min. walk) to the train station and both main metro lines, you can also walk to the main historical sights although it requires some 20-30min. walking. The neighborhood is what would one expect from an area close to the train station, but felt safe even when we walked late night. Easy to shop for food around (Conad supermarket is around the block).
2. A friendly and helpful hostess - Giuseppina met us in person after our arrival, explained everything about the apartment etc. The map she gave us was the best I got (had also some other book guides). She was available on the phone & whatsapp during our whole stay, responded quickly and advised on directions etc. Very helpful.
3. The apartment is clean with modern fixtures, 4th floor with a lift and a little balcony. The building is not very nice, very rundown inside, but the lift was working ok. The only negative experience is that we could hear some loud Italian neighbors from upstairs (not too often though), but it added up to the "Italian experience" :) The little balcony is very handy. The kitchen desk is small, but sufficient for all basic food preparation. The living area is very spacious, the master bedroom too, with two large wardrobes including hangers. The second bedroom has one larger bed, which is OK for two kids, but might be too small for two adults.
In sum, we had very good time in the Minerva's place and can only recommend it to other travelers.