Hi there. I just moved to Sheboygan not too long ago. I don't really know much about the charter schools here other than to say that I've heard ESAA is good. Have you gone to the districts website? http://www.sheboygan.k12.wi.us/schools/charter.html
As for neighborhoods, I've heard people prefer the north side of Sheboygan or down by the lake but there are some nice areas all over really. I like the south side over by James Madison Elementary. I currently live over by Grant Elementary and it's a decent neighbord.