I'll be spending one night in Madrid the night before I return to the states on April 19th. I'm trying to find a central hotel near the Puerto del Sol/Plaza Santa Ana so I can go tapas hopping. I'll be on my own so I need to feel safe and don't want to have to walk far. My budget goes up to 100 euros, however I prefer non-chain hotels with atmosphere. I tried Hotel Europa but they're booked. I should probably book quickly as this is the day before Easter.

Thanks in advance for your help.