During the summer I will be living in a remote location. I want to access the miners remotely to restart them and change pool data etc. Would that be possible with a Rasberry Pi?
Also, how big is the risk of fire? I'm not sure if I'm confortable leaving the miners on for 3 months without surveillance. Are the S3s stable enough?
You can setup your Pi to be a VPN server so you can remote login to your miners. It's a bit of work to get it running, but once you do, it's the next best thing to being there

. I'd suggest starting here:
http://readwrite.com/2014/04/10/raspberry-pi-vpn-tutorial-server-secure-web-browsing