The location is great! It was so close to the Vatican (approximately 10 min walk). Also, quite close to the bus and train station (5 min walk). The apartment is a bit of a hike up flights of stairs so it could be a challenge for anyone with a large suitcase, stroller, and baby, as we did. However, it was manageable.
We made a request to see if Gaia could procure a playpen for our infant son for our stay. She went out of her way to get one, which we greatly appreciated! She was very helpful in letting us know where things were, places of interest, and nice places to eat.
The only issue we had was the cleanliness of the floors. Since we had an infant crawling around, we noticed they weren't as clean as we would have liked. My wife and I ended up vacuuming and cleaning the floors ourselves.
We did enjoy our stay at Gaia's and would recommend to anyone looking for a place close to the Vatican, close to public transport, and a quaint and quiet location. It is a great value.