It is a single family home that I lovingly refer to as "The Cat Pee House" - as it turns out the cat pee was just the beginning of what was causing apotpourri of foul smells. 

Foul ball.

I went over and found lots of water there, they said that it had been like that for a couple of days, but they aren't down there much and didn't notice until it started smelling. 

Understand about the bank's position and unfortunately at this purchase price it's typically 'first time buyers' with little to no money down.But the thesis you are working on there smells of collusion: bank wants a better ratio or less money in therefore 'works with' the appraiser to lower the purchase price. 

The existing tenants have mentioned separately (this is an up/down duplex) of smell of mold.This is not difficult to believe if in fact there are these obvious cracks on the home exterior.There is no doubt water/moisture is getting into the home and creating a condition for mold to grow.We had a structural engineer out to do our buyer’s inspection yesterday, report is due out later this evening (11/04/17).Verbal communication while on site, indicated a mutually shared concern over these cracks.The roof appears fine.A wall in the backyard will need replacing as the soil weight has almost pushed this wall over and it is only a matter of time before this thing comes falling over.Boiler may need replaced, windows as there is some clear cold.These are just concerns at this time but inspection report will lay all this out once received later today.I should have been a little smarter in not agreeing to a change in inspection objection deadline when it was presented by seller.My buyer’s agent and I should really have talked this one over, as I realize now that, it left us with only hours after inspection to come up with our inspection objection response and to be honest I will not have time to get bids for any of the extensive repair items which I do not doubt will be confirmed in the report received later today.Seeking any advice that you can give on the following: Would you proceed with purchase of the above detailed home?

The next guest even complained about the smoke smell so I called the guy out for a second time with this machine to get rid of the smell. 

All unit being vacant for they type of cash-flow, smells to me.

Im smelling TROLL type behavoir here....................lol. 

This could be an interesting and educational battle.

If your guests leave reviews that the bed is uncomfortable or the couch smells or it doesn't look "homey," then you'll have a harder time drawing in future guests.