temporary rental to an insurance company

I was contacted by an insurance company to my 3 bed, 1400 sqft C class Indiana rental for letting them place a customer there who's house burned down for 4 months.  I have it listed for 845/month which is a medium/medium-high amount for the area, if I agree to this what would you say would be a fair mark up premium for such an agreement considering I'd be giving my listing agent 1/2 month rent and the wear and tear on brand new carpet/flooring/paint?  

I was thinking about a 20% markup making it an even 1000/month

thanks