We were in Rome because our daughter wanted to see the Colosseum for her birthday, so Valerio's place was perfect for us: you walk halfway down the block, turn the corner, and there it is! Perfect location! Also an easy enough walk from Termini -- maybe 20 minutes, down Via Cavour and then up the Borgia stairs and close by St. Peter in Chains. But also just a minute or two from the Colosseum metro stop if you don't want to walk. Either way, convenient and easy to find.
The apartment is small, but the four of us (two adults, two young kids) were comfortable -- perfect for breakfast, quick breaks during the day, and sleeping. I see that other reviews have mentioned the small bathroom -- I am 6'3" and I managed just fine in bathroom and shower! Bumped my head once in doorway but learned my lesson and did fine after that.
Valerio was an excellent host -- quick to respond, flexible with check-in time, and very helpful. He sent a great list of recommendations for restaurants, bars, and cafes, and we had good luck at several of them. He also let us leave our bags for an extra two hours on our last day in town so we could squeeze in some extra sightseeing before we took off -- much appreciated!
All in all, a great stay! Highly recommend to solo travelers, couples, or families that, like ours, were planning to spend most of their time out exploring the city.