@Lyndi6 I agree you should refund. If the place does smell like new paint and has gassing-off issues from new flooring, countertops, etc, you can't expect people to stay there until the place is aired out sufficiently. You may need to get an ozone machine, fans, etc, to help with that.
Here's an interesting factoid- I read that while you would think that oil-based paint has more toxic fumes because it smells so strong when using it, people who have allergies to fumes like paint, use oil based paints in their own homes, because once the paint has dried, it is inert- it no longer gasses off. Whereas latex paints gas off forever.