Hi ShinyK,
I went to a rereat in Spain for a week to finish my novel last summer. I stayed with an artist, Meg Robinson, who opens her house for people to retreat to for various reasons (creative, spiritual ones, people grieving and overcoming traumas, etc.) She offers creative workshops and exercises or alternative treatments if you want it, or you can just be left alone to do your own thing (as I did).
It is out in the mountains in a remote part of Spain, but she can arrange a (cheap) lift to/from Granada airport (or there are buses). Also, Meg drove out to the nearest town a few times and the offer was always open to go with her. The town is full of artistic and alternative types, most of them Brits, so there's people to chat to if you start to feel too isolated! You can be self-catering or she'll cook for you and is happy to cater for special diets (she's a fantastic cook and it's all fresh, organic local produce). It was very hot. When I wasn't writing I would go for walks in the mountains, do yoga, chat to Meg (or another couple who were there at the time) or read some of the books she had around the place (loads of interesting books on creativity and other topics that interested me).
I had 2 rooms to myself - a bedroom and a study. There was also a roof terrace and I went there and wrote a lot. Meg was also happy for me to use the rest of the house as I wanted. She was a lovely host!
It was also a very economical trip!
It was a pretty mad thing for me to do, being a born and bred Londoner, but I'd recommend it. I finished the novel and it was also a good experience on a personal level.
You can get more info here:
http://www.healingartjourneys.com/workshops.htm
Cath