My wife and I, and other relatives, stayed at the Belmond Splendido Mare for 3 nights. This is a smaller, sister hotel on the waterfront. Unfortunately, Ferrari was conducting a car show there (for its new Portofino model) and blocked off several of the streets and the waterfront area for 2 nights. That ruined some of the glamor of the stay. Even without the car show, I think that staying at the sister property on the hill, the Belmond Hotel Splendido, would be preferable. That is a stunning property with great views and a swimming pool. There was a free shuttle bus that would take you between the hotels, so all facilities were available to guests at either location.
My room (number 511) was comfortable. My wife and I had a balcony that overlooked the street (and the Red Carpet during the car show). It was good for sipping wine and people watching. The staff was friendly and helpful (to me), and spoke excellent English. However, my sister-in-law who organized the trip had problems with the Assistant Manager with dinner reservations and his condescending attitude towards her. She had to speak to the General Manager at the Belmond Hotel Splendido about the issues.
The breakfast buffet was OK, but not too extensive. You could order eggs, pancakes, etc. from an a la carte menu. The food was good. We enjoyed eating in the outside area with a (limited due to the car show) view of the waterfront.
I had laundry done here (shirts, socks and underwear). The laundry service was the most expensive of any of the hotels I stayed at during my nearly 3 weeks in Italy, including other 5-star hotels. The fact that no prices were provided in the room should have been my clue.
The hotel is a short walk, about 0.1 miles, from the shuttle bus stop and car park.