We booked this restaurant in advance for a Friday night in May, and were sat outside on the lovely quiet and elegant via Margutta. It's a beautiful peaceful spot, yet very close to the Piazza di Popolo and a shot walk from the Borgese where we had been watching the sunset from Pincio hill. It is worth a wander down the street before or after dinner (It's also the street where Gregory Peck's apartment was situated in the film Roman Holiday)
It was great to find a vegetarian restaurant in Rome. The service was very professional, although could have been a bit friendlier, less formal. The menu was very interesting, and imaginative, and the wine list extensive. We enjoyed our food but felt that our main courses, although sounding and looking great, could have had more flavour, I had Spaghettone with squash flowers and courgette 'cream' but there wasn't much flavour to the sauce, or much of it, my partner had Vignarola, which was a little mixed, she enjoyed the artichoke component best. The starters of Avocado and papaya salad, and detox salad were very tasty though, and the bread was superb.
The gianduja, mango and coconut dessert we shared was very good.
It's not cheap for a veggie dinner, 90 euros for 2 starters, 2 mains, 1 dessert and a bottle of Etna Rosso wine, but the location and service obviously add value.
I would recommend for the most part, especially if you can get an outside table.