Hi, Eric - If you're looking to be near Excel, you'll want to be in the 80005 area code of Arvada, or potentially the southern end of Westminster. Woodrow Wilson is also in that same general area, in or around the 80021 area code in Westminster.
Since you're looking at Charter schools, I'm sure you've found you're unable to search specifically for homes that feed into those particular schools (the Charter school admission is all based on a lottery). However, if you're in neighborhoods feeding to Sierra/Meiklejohn/Campbell/Warder Elementary Schools, you'll be relatively close to Excel. Zerger & Lukas Elementary are both near Woodrow Wilson.
I just helped a family that relocated from out of state find a rental home one block from Woodrow Wilson in the Sunstream subdivision, so they're certainly out there. I agree with Nick, Craigslist is hands down the best option for finding rentals in Denver and the surrounding metro areas. Focus on N. Arvada and SW Westminster and you'll have the best luck getting near those schools.
On a related note - if you're looking for enrollment for next year. I recommend, you submit for enrollment to get on their lottery systems ASAP. As you may know, if you live in the neighborhood, Charter school admission is not automatic. Woodrow Wilson, in particular tends to quite difficult to get into.
I'm happy to answer any questions you may have. I work almost exclusively in the Arvada area and have children in the schools right near where you are looking.
Good luck in your search!
Keller Williams Avenues