The Trastevere color-suite was everything it said on the website and more. much, much more. Marina is a great host, with such an attention to detail that the appartment had literally EVERYTHING (even the anti-mosquito devices - we didn't use them though). The fridge was stuffed with breakfast goodies. And everything was SPOTLESS.
Marina met me at the appartment and showed me around. She was very friendly and helped to arrange a taxi for my parents, who arrived the next day from NYC.
The neighborhood is great - has a nice local feel (and the best restaurants in town), it was walking distance to both the Vatican (about 2-3km along the river), and the forum (about km in the other direction). It's positioned such that you can reach many major sights by foot. Of course, there's also a bus, but we didn't use it. The area itself is not overrun with tourists, so it was quiet at night and we got very good sleep everynight.
There's a supermarket around the corner and about a dozen of restaurants down the street (or more, didn't get to explore this time around). I will definitely go back and stay there again! Highly recommended.