Since we went swimming in the outdoor pool, we've seen the previous reviewer's comments (who must have visited a couple of days before us), which are all absolutely spot on, so won't repeat them all here (NB it was about 12 Euros for a adult, 7 Euros for kids under 14). It's just surprising that more tourists don't come to use the pool for an Olympic experience, given that there's a steady stream of Olympic tourists a couple of hundred yards away looking at the stadium.
So folk are aware, the pool is cold and slightly salty, but it is very quiet. The price is a bit of a deterrent, but payment gives access to all facilities including the lovely (and busier) large indoor heated pool and gymn facilities.
The cafe is excellent value-for-money and the the staff were vey helpful and patient considering that it's principally a local's facility rather than a tourist one. They also have a shop selling towels, hats, goggles, etc - so no excuse for avoiding a spontaneous swim!
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