I used Public Storage on Mystic Ave (across from Blockbuster Video) for several years. They have later access times than a lot of places, which helps when you have a job that works you a bit later, and it's all inside storage as well. Prices are pretty good, and for first time users, they have a good deal of something along the lines of $1 plus initial fees (so like $30) for the first month. Bring your own padlock with you, or you'll have to purchase one of theirs, which is usually a buck or two more expensive than a hardware store.