Pietro's place is so cute. Walkable to almost all major attractions (we took a cab to the Vatican museum, but because of a taxi strike when we were done, we ended up walking back to the apartment...took about 30 minutes...with kids). We also walked back from the Colosseum and that only took about 20 minutes. Taxi stand and laundry also very close. You have to check out the cat sanctuary right next to the taxi stand.....if cats are your thing.
The apartment is very spacious and clean. The sofa bed upstairs has a slide out mattress to either make a double bed, or separate it and make two singles, which was great for my 12 year old boy and 14 year old girl who were adamant not to share a bed.
The hot water tank is small so you will want to stagger showers. But, the temperature was great and pressure was good.
It is super noisy due to the location, so if you are a light sleeper, bring earplugs.
Overall, a great place to stay for our first trip to Rome. Would definitely stay again.