Paradise of shopping
This street is a paradise for all those who like shopping. There are many shops along the street, clothes, shoes, whatever you want and of all styles and colors. The design shop windows are constantly in competition to be the coolest and even though they won't let you take a picture to prevent plagiarism, from the street no one can tell you you can't.
Also the colorful Fuencarral flea-market is worth visiting. It is not the best I have been to, for sure, but the friendly locals and stall-keepers make this flea-market somehow special...