I stayed in this apartment together with my brother during our holiday in Rome.
It's based about 15 minutes by foot from Roma Termini and its perfectly located for any trips in the old or downtown of rome (Colosseum was about 15 minutes by foot away).
The closeness to roma termini is a big plus if you're planning day trips to the beach (Lido di Ostia) or the country side, for example Tivoli.
Local public transport (Metro) is also in the surrounding of the flat.
Also the apartment is rather big, which makes it perfect for a longer stay and has two separated bedrooms. Living room and the two bedrooms do have air conditioners.
What else to say? the flat is fully equipped and cozy arranged. Cafes, restaurants and supermarkets in the surrounding.
Antonio is a great and friendly host, who provided us a filled fridge, when we arrived on a sunday.
Conclusion: I can only recommend this apartment!