Piero met us downstairs and helped us with our luggage and then gave us a full tour of the apartment and suggestions on places to eat. He even called a place to try to get us dinner reservations for that night. He is an excellent host.
The place has an elevator but you have to go up about 4 stairs and then down about 6 to get to it. The elevator itself is small but we were able to squeeze myself, my wife, and our son in a small stroller into it.
Piero's place was perfect for a small family with a young child. To get to the back room you have to walk through the master bedroom, but with a 1 year old in a baby cot/pack and play it was perfect for us. Piero also provided a high chair for us. The is also very close to a playground with many play structures and toys that our son loved. And that playground is very close to some of the best gelato in Rome.
Piero also was able to arrange an airport transfer for us on the day we left as we had an early flight out of Rome and it made our travel day much easier.
We love staying in Trastevere as it is such a fun neighborhood, but that can also mean loud. This was not true at Piero's place as it was off the main streets so it was quiet but still close to all the great places in Trastevere.