Hello del Sol,
I highly recommend
Eyewitness Travel Guide: Madrid if you are looking for a general, informative and handy guide, this would be my first recommendation. It has the famous Eyewitness three-dimensional drawings, floor plans, and detailed area maps. It even includes the Metro map. In addition to the historical information, it has dazzling photographs, sometimes they can help you choose what to, or not see.
For Metro maps: You can go to
Amazon.com and view
City Transit Map: Madrid By The Metro
A Guide to Getting Around
TG412878 Folded, self-cover, paper map Michael Brein, Inc. (USA) 2-sided 18x26 1999 {3} - USUALLY SHIPS IN 5-15 BUSINESS DAYS (1-3 Weeks)
Michael Brein's Transit Map Guides combine a map of the local underground transit system with concise directions on using the system to reach popular attractions, including notes on where to walk once you emerge from the station. These lightweight folding paper mapguides are convenient for pocket or purse, and make a nice complement to your city street map.
Our Price $5.00
You'll need it if you want to use the Metro!
If you cannot find a copy of the Let's Go map of Madrid that Taravb recommnended try
Streetwise Madrid by Michael Brown You can also purchase this guide from Amazon. What I like about it is that it is small enough to be inconspicuous yet large enough to find the street you're looking for. The best feature is that it is laminated and quite handy.
Saludos,