I personally have only ever had good experiences with etsy, both as a buyer and a seller. I primarily buy and sell vintage goods on the site.
It's fairly easy to use. When you list an item, you simply fill out a page containing details on the item. For example, who made it, what it is and when it was made. Then choose a category that best fits your item. Other information includes the title, description, photos (you can add up to 5), price, and shipping details. (There are a few other details you can fill out as well but I've listed the primary ones).
To answer your question about shipping: Yes, you can select an option to only ship to Spain.
Etsy's fees are very reasonable in my opinion. It costs only USD $0.20 per listing (each listing lasts 4 months, you can renew the item later for another $0.20 if the item does not sell) and they charge a 3.5% fee on the final price if the item sells. If you are selling multiples of the same item but with different variations such as color you can add all the different variations available in one listing so you don't have to make multiple listings for the same item (for example if you have 5 different colored scarves you can have one listing with a drop-down menu to choose the color rather than list each one separately).