Tullio is the only restaurant on the list I've eaten at (that I remember). We enjoyed it. It's not entirely casual, but it is laid back. I'd describe it as a neighborhood atmosphere except for the fact that it gets a lot of tourists, who obviously would not be living in the neighborhood. I do know some of the area hotel concierges send folks there. For fairly informal, definitely Roman, food, it's a good option.

Italians don't do much for breakfast, but many hotels will generally do an American style breakfast. I usually skip it so I can't tell you where it's good and where it isn't. I'd just grab something on the walk out in the morning - remember that a "bar" in Italy isn't a drinking hole, it's where you get coffee.