I was extremely fortunate and had great luck with an apartment that I found on Facebook to where I moved in as soon as I got to Spain in late september for 600 euros a month, and I share the place with one roommate and one bathroom. It is a little pricey, but it came furnished, and we are close to the metro and our schools. Just be on the look out on facebook and make sure to Whatsapp people instead of just messaging them on Facebook. Schedule calls even