We had an excellent week at Due Relais. We stayed in the 'Panoramic Room, Queen Bed, Balcony, Sea View'. The hotel was everything we needed and more. Immaculately clean, stunning balcony views, minibar drinks and snacks included, a small kitchen, and a lovely breakfast every morning (a nice cappuccino too!)
The staff and the manager, Illaria, are so welcoming and really make you feel at home. Illaria also helped us with recommendations of the local area and helped us with planning days out. They all went above and beyond during our stay, nothing is too much hassle.
There are a fair few steps up to the hotel via the private path, but they are worth it and provide easy access down to the marina/ beach. You also get sunbeds on the beach included.
As for Vietri Sul Mare itself, it's a lovely traditional and authentic place to stay, full of locals, quaint but with plenty of atmosphere and amenities in both the main town and the marina. Lots of choice for restaurants, gelato, bars, etc. The marina also provides a great base to explore the Amalfi coast.
Cannot recommend this hotel or location enough!