saweber95 - We were in Madrid last November and it was Zarzuela season! Check out www.teatrodelazarzuela.mcu.es/en . We reserved tickets from home for a theater box along the side, and picked them up at Will Call just before the performance. At Intermission, step out to the bar for a glass of cava. A digital screen above the stage provides lyrics in Spanish and English. The lighting and costumes were fabulous, and this tradition goes back well over 100 years in Madrid.
The Prado art museum is perhaps the world's best, but it's BIG. The Reina Sofia has great modern art, including Picasso's Guernica. If you're planning on just one museum, though, and aren't necessarily set on one of the two above, consider the Thyssen-Bornemisza, which we also visited, and were very pleasantly surprised by its substantial, quality collection.
Bullfighting season has ended for the year, but Rick Steves' guidebook mentions some Madrid bars that reflect a bullfighting culture. We didn't take a siesta - places we went were open thru the afternoon and people were out and about. Haven't followed up on the current situation, but there was a garbage strike a year ago and the sidewalks were filled with trash - hopefully you won't encounter anything like that this November! Also, compared to home in Colorado, it got light later in the day and seemed to get dark early.
Jamón (ham) is king, and there are different levels of aging and quality, priced accordingly. Jamon Ibérico de Bellota is the finest. Get papas bravas (fried potatoes covered in spicy sauce). Two places where we got great Spanish food (in the La Latina neighborhood in Madrid) were Rayuela at Calle Morería nº 8 (www.tabernarayuela.com) and Juana La Loca at Plaza de Puerta de Moros, 4. And whether in Madrid, Granada, or elsewhere, don't miss churros con chocolate!