My former fave spot to spend an evening with the fountains, a friend, and a bottle of wine was Fontana next door, but when they decided that place wasn't hip enough and needed some renovation, Mr. L and I tried Olives.
Now my 4*'s doesn't cover anything like entrees bc we didn't order them, but with our wine we got excellent bread and an olive plate, and left alone with our lovely view of the fountains. No pressure to eat or leave, no pressure to finish the wine and give the prime table back to more lucrative guests... Something that didn't go unappreciated.
Maybe next time I'll even try the food!