Almerimar is popular as its one of the best balanced and best value marinas
on the Spanish mid coast. Kemer is not the cheapest in Turkey
but we too kept our yacht there for one season and we'd also vote for them.
If you want cheap storage
for a cat you could consider on the beach in Southern Portugual!
Just off Faro / Olhao is the low sand island of Culatra - you can go look at it via Google Earth
. 'Faro' gets you the shots of the region quickly.
On the norther side of the island you see south of Olhao, you can zoom in to the main sheltered lagoon
and see many of the cats people have left there in past winter (and summer) months.
Invariably there will be some livaboards who can keep an eye on your yacht whilst you are away - or failing that you can find a local fisherman (the only people living on the island in winter months) to do that for you. Theres not much happening on Culatra in the winter - so this guarding role is one they take seriously.
only a short ferry
/ cab ride away with probably cheapo flights up to Scandiwegia.
It is a lovely place to stop on a boat - lots of wildlife and absolute tranquility - but super well protected during winter storms.
Oh - and it costs nothing but what you pay to have the boat looked after.