70 gb is a bit tight for a windows install for gaming.
I'd not bother, and limit gaming to stuff you can get for Mac on steam instead. Yes, it will limit your selection a bit, but blowing 70 GB on a 256 GB drive to only be able to fit a couple of games is a big chunk of space for not a big benefit if you ask me.
Also, the 13" MacBooks aren't great for gaming anyway whether or not they're running Windows or OS X.
2c.
edit:
I guess an option may be to install games to an external drive within Windows, but yeah....the 13" machines aren't gaming powerhouses anyway so...
For the few apps you might need Windows for, i'd install it in a VM, you can get away without allocating quite so much space to it via thin provisioning, and don't need to reboot for it either. Plus you can copy/move the VM if need be to an external drive to free up space either temporarily or permanently, something that's a lot more painful to do with bootcamp.