I recommend this air bnb extremely highly. It was absolutely perfect for me as a solo traveller, and it could easily host a couple. It has an awesome location (I think it took me 15 mins to walk to the colosseum) and there’s a handy metro stop right outside.
This Airbnb was great value, and also has an amazing host who greeted me on arrival and was responsive to any questions I had. Rome was extremely hot whilst I visited, so the air conditioning was also a blessing. 10/10