Great advice here from Duke - I'd also suggest dispersive acoustic panels on side walls at first reflection points if they are bare - you can have some made to suit whatever the wife wants - from family photos to artwork to even being creative, such as small 3" deep display shelves of different lengths to hold knick knacks. It doesn't have to be an ugly RPG skyline professional panel to make an improvement...just remember to keep edges broken up - no solid single unbroken harsh corner edges and the more variety the better. The idea is to reduce the energy of the first reflection to 10 db lower than the primary signal - this will really improve imaging at the listening position.
Wood products can be made to look nice - Wood diffuser/absorber
Wood products can be made to look nice - Wood diffuser/absorber