I have just returned from staying at this hotel and I thought that the overall experience was fantastic. I was aware from reading other reviews on Trip Advisor that the staff could be rude, but I found everyone very friendly and the concierge service was especially helpful. The rooms were kept very clean and the bathroom was huge.
The prices for food and drink in the hotel are terribly expensive but there is a cafe about 2 mins walk from the hotel that overlooks the marina which is much cheaper. The hotel is located about 3km from Porto Cervo so we found it neccessary to rent a car to get around. There is no beach at Poltu Quatu, but we found a lovely one called Piccolo Pevero which is a 5-10min drive away. If you do rent a car, there is plenty of free parking by the port and it only takes 3 mins to walk to the hotel.
Be aware that it will cost €25 - €30 to get a taxi from the hotel to a restaurant in Porto Cervo. The area is not cheap and restaurants can be very expensive. Poltu Quatu itself is very small with only a handful of restaurants, so it is worth getting out and checking out other places.
I would definitely go to this hotel again. It may not be as glamorous as the other 5 star hotels in Porto Cervo, but it is priced well to reflect this.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC