posted by in Spain forum
The obvious place to look (as mentioned a few times before) is idealista.com however, watch out for agencies as they will ask for 3-4 months (and in some cases more) in advance. Private landlords will most likely as for 2-3 months inn advance.
Another site to check would be spotahome.com although they can be unreasonable and overpriced. I would also recommend Badi. It´s a mobile phone application that current tenants or landlords use to publish extra rooms in their apartments/homes that are available. It´s my personal favourite if you´re looking to flatshare as you can communicate with the point of contact directly and at that very moment. It´s like the Tinder of flat sharing apps.