This place is great! It's set in a small quiet piazza. There are a couple restaurants with outdoor seating,so there is some ambient noise with the windows open, but none of us (including our three-year-old had any trouble sleeping.
If you're staying in Trastavere, you'll have access to so many restaurants, but the kitchen was perfect for breakfast and a couple meals we made at home.
The master bedroom and bathroom are huge, and the second bedroom and bathroom, while smaller, are very nice.
Check-in was easy, the caretaker lives a couple blocks away, so she met us when we arrived. Check out was even easier, just leave the keys and close the door.
The place was beautiful, clean, and perfectly located. You're in the heart of Trastavere and within 20-30 walks of Rome's main attractions. There are a couple places nearby to rent bikes if you want to get around faster (30 minute walks turn into 10 minute bike rides).
While there is no laundry in the apartment, there is a laundromat less than a block away that does full service laundry for pretty cheap (or you can use the machines yourself) and quickly (same day if your drop off in the morning).
When I visit Rome again, this is where I'd stay. I recommend it to everyone!