I'm always up for putting people at ease about NYC. I was born and raised in Washington Heights, and it is certainly one of the least expensive parts of NYC right now, and only about 15 mins to 125st, which is where you'd get off of the 1 train to get to school. If you've experienced Berkeley/Oakland (which I only visited recently myself!) then you'll be fine! Just be street smart -- stay on well-lit areas, etc, but honestly, Harlem is nothing to be afraid of. Broadway is main street so you'll always have places open (corner stores, etc) where you can pop in if you ever feel unsafe, but as a small young woman myself, I'd say I've never felt at risk. I actually really like the 1 train because it goes through so many different kinds of neighborhoods, which means a variety of people ride it. Also, it has a stop about every 10 blocks, so you always feel that you can get off the train if you wanted to and walk. So please don't be afraid