Just a bit of throw away advice to anyone staying close to metro stop on the light blue line - Check if your stop is under maintenance. I'd be amazed if there was still problems with it because this was back end of August, but I just thought I'd pass it on. There was no trains running inbetween Sol and Atocha, and seen as I was staying close to Anton Martin it was a bit of a pisser walking around with luggage, especially after a long day. They did have buses going between stops instead, but if your Spanish is as poor as mine it is a little confusing, so I thought I'd warn in advance even though it's unlikely to be affecting anyone now. I'd still ask your hotel/hostel when you book though, just to make sure they're not doing work when you're out there.