Rentals are very hard to find right now in Valparaiso--especially furnished. You might try large property management companies to start. Keep an eye on Craigslist, and even check VRBO.com (short term vacation rentals) to see if something comes up for rentals in Valparaiso or Valpo. If you need, I can also search the Northwest Indiana GNIAR MLS for you as well.
Matt Evans, Keller Williams Realty, 219-241-8401