Six Senses Douro Valley sits in a 19th-century manor at Quinta de Vale de Abraão, on the south bank above the river between Lamego and Peso da Régua. It opened in 2015 in the former Aquapura hotel and runs to 71 rooms, suites and villas, including two villas with private pools. It is the one hotel in this edit where you would not leave the grounds for days.
The spa is the argument: ten treatment rooms, an indoor pool with underwater sound therapy, a thermal circuit, an outdoor saltwater pool and an Alchemy Bar where you make your own scrubs from the garden. Vale de Abraão cooks from the estate garden and wood-fired ovens, and the Wine Library pours the valley by the glass. Reviews are consistent on service that anticipates rather than reacts.
Getting there is the trade. It is 75 minutes from Porto airport and nearer an hour and a half from the city; the hotel's private airport transfer is EUR 295 per car, and the train to Régua takes about two hours plus a short taxi. Book it for the valley, not as a Porto base.