The Pool at Palacio Ramalhete
The pool at Palacio Ramalhete is endorsed by professional travelers. Of the 3 professionals that we tracked, 2 mentioned the pool, such as Oyster and Mr & Mrs Smith.
Palacio Ramalhete 
Oyster
Mr & Mrs Smith
Oyster "LX Boutique Hotel is an upscale hotel that's 10 minutes closer to the action, but it lacks the pool found here"
Mr & Mrs Smith "And just as I’m contemplating whether it’s possible to reach my book that’s lying in the shade of a giant shrub without exiting the pool, some free entertainment begins: another poolside-dozing guest gets a call from a friend in London who has become embroiled in some romantic goings-on so outrageous the plot-line could have been lifted straight from EastEnders"
