Hey Tommy,
The occupancy rate is concerning. I wonder if you could work out some sort of agreement with her to fill the property first. If the market is no problem for leasing and all the units are in good condition, it shouldn't take her long to get tenants in all the units. She will certainly attract more investors if the property is fully occupied. I'm not sure how much interest she has in the building but if you can have her lease up the property with qualified tenants first, you will be taking a lot less of a risk.
She does not need to deny applicants due to children. She could get in some trouble here.
As for the furniture, I would buy it without. I am no expert in antiques but I do not imagine it will help you with leasing and the value of each piece is only worth what you can actually find a person willing to pay for it.
Overall it sounds like you may have found a great deal. Do your due diligence. If you reach a point where you think you've researched too much and asked too many questions, you've probably just done enough.