We stopped here based on recommendations of our hotelier. We had a good meal, and were able to partake of the splendid views right into the gorge of the Villa Gregoriana (the entrance to which is literally right around the corner.
Ciocco's indoor seating (and emphatically their outdoor patio) have wonderful views into the park. A great place to hang out.
The food is pretty standard Roman fare, but its all well done. The service is attentive and friendly. My one (mild) disappointment was in the wine list, which is geared more (I think) to international travelers and less to those looking for local Vino from Lazio. Admittedly, however, this is a personal hangup; there is plenty of good wine on the list, at a variety of price points and from a variety of countries.
The place clearly gets a local crowd, so its not all geared toward the many tourists who flock to Tivoli. We were there on a rainy Monday night and within an hour of opening, the place was packed with people who clearly knew the owners. I tend to see this as a good indicator of overall quality.
We weren't in Tivoli very long, so I have no other local basis for comparison, but I'd certainly recommend this place read more