I've been reading the posts for a while, and have already got lots of good ideas from you all, for which many thanks. This is my first post.
I spent four days in Madrid last week, and am going to return for ten days in January. I stayed, and will stay again, at a hostal in the Calle Cervantes, on account of its proximity to the Prado and the other two main museums. The Cerveceria Cervantes is a stone's throw from my bed, and I ate there a couple of times and liked it a lot; and being somewhat unadventurous, would be happy to settle in there and eat my way through all they have to offer. But that does seem a bit unenterprising, so I'd love to have your ideas about other places in that area or not too far afield.
I'm travelling on my own, and I like places that I don't have to change clothes for, places that I can just slip into after a hard day's looking at pictures and feel comfortable in, eat decent food, and then go home and go to bed early. That really lets out most restaurants, I suppose - I'm usually asleep by the time Madrilenos start their dinner - but that's ok: my preference is for tapas anyway, just as in Greece it's for mezedes.
I'll be grateful for your thoughts.