Nice set up, but I hope the S1 is undervolted, otherwise I can't see why running a S1 today would be worth it. An S3 will use the same wattage as an S1.
My electricity includes in my apartment's flat rate rent. S1 is actually slightly overclocked
Regardless of who is paying for it (your landlord in this case), a more efficient machine would serve you better. Get a used S3 (they're cheap!) and for the same wattage you get 2-3x the hash rate.
I'm saving it to see if I can upgrade it by possibly buying the community miner boards in the future (Sidehack).