I've been to Olivio too many times to count and there are a few special things that keep me coming back. Restaurants are primarily about the food - there are a few dishes I find irresistible; shrimp cocktail, steamed mussels, chicken parmesan, butternut squash raviolis, roasted cod and chicken bona bocca to name my favorites. Portions are large. The wines are excellent but a bit pricey, drinks are plentiful and reasonably priced (but not that many choices). The service is very good - always welcoming and attentive. The noise level sometimes rises a bit too high, especially in the small room next to the bar. One of the best deals with Olivio is that if you join their mailing list - you'll get regular discount coupons which will entice you back - they make the total price very reasonable.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.