Wallpaper and Wallcoverings - price quote for removal of paper and painting

I'm a realtor and I have a listing that's in dior need of neutralization--mainly being the wallpaper needs removed and some neutral paint. The gold foil look hasn't been in since the early 80s!! I've told the sellers to either neutralize or take $20k off their price. They want to neutralize! :) .... My husband has offered to do it for a price (he wants new golf clubs hehehehe) but we have no idea what to charge. It's a two story foyer and a powder room and I may even be able to talk them into taking care of some of the bedrooms. We have no idea how many layers of paper, how long this will take, if we will need a steamer etc... Anyone have any suggestions?? I think we should charge hourly--my husband says to quote per room.

Obviously he doesn't do this for a living.
Thanks in advance for any help.

Yes, quote by the room. Clients like a firm, fixed price.

Figure out about how long it will take for each room. If you've done this before, you should have a good idea. Now put a price on your labor, either for a days work (such as $150/day) or hourly (say $15/hr).
Now estimate materials. How many gallons of paint will it need and how much will that paint cost. Will you use DIF or other commercial stripper? Add in that cost.

If you think there's a lot of work, then figure that in to your time. ie) say you've been able to strip the paper from a room in a day before. But you expect this to be much harder. Then figure 2 (or 3) days labor.

If you guess well, both parties will be happy. If you guess low, you will end up working for minimum wage. If you guess high, you make out very well. But that's business.

Total it up and that's your charge.

You can add a contingency for renting a steamer for a week, but list that separately.