My sister and I rented this apartment for one week. It was quiet, clean, and airy, just a short distance away from the steps leading up to the Vatican museum in a lovely neighborhood with wonderful dining and shopping (including a fantastic little bakery on Via Barletta called Dolce Maniera). We slept like rocks in our comfortable beds, and the bathrooms were nicely appointed (although the showers were a bit tight on space).
All of the appliances were relatively new and worked just fine, and the layout of the apartment suited our needs very nicely when we opted to eat in. The kitchen is a bit short on cooking utensils, but nothing we weren't able to work around.
Both the owner and the manager were prompt, professional, and pleasant---no complaints on customer service at all.
If we were to choose the pièce de résistance of the apartment, though, it would have to be the terrace. That is where we spent every morning and every evening (when it wasn't raining), we loved it so much there. It was our retreat after a hot day of Coliseum and chiesa crawling!
All in all, I would stay in this apartment again in a heartbeat and would gladly recommend it to others. Thank you for making our stay in Rome so enjoyable!