Overall, we had a great time at Aldo's place and we would definitely recommend it to others.
Pros
Air conditioning works great. It got TOO cold even during the hottest summer Europe had in over a decade.
The location is amazing. We easily walk to the Trevi Fountain and Spanish Steps. The Colosseum was a bit further, but also walkable. The only place you'd really want a taxi for is the Vatican.
You're not going to find many places that can hold this many people this close to where you want to be.
Aldo is SUPER responsive and very nice and accommodating. He answered every question super quickly and met all our needs and then some. Great guy.
Cons
As others have mentioned, the con of being right in the middle of the city is that it can be really noisy. You're basically in downtown Rome, so expect loud traffic and people noises pretty much throughout the night.
The mattresses and pillows could use a little updating. I'm not sure if it is a European preference thing but some seemed thin, hard, and/or worn out.