You'll need drain plumbing for the washing machine.

One of my tenants washing machines just quit working (it doesn't fill with water), it was a pretty old machine and they have been in the house 3 years with no prior issues. 

They can give you guidance, help funnel you deals, and do the Realtor work for you so you don't have to.When looking for deals without a license - driving for dollars, buying absentee owner lists off propstream/deal machine etc, then writing letters, calling, and door hangers could be a good way to build traction.

Now, our friend would like to wash her hands of the property (and her grandmother) and reached out to see if we would be interested in purchasing.

@Shay Kent when he was making the percentage, how much was he making per year?

The stack washer and dryers are expensive and from my experience they don't seem to last too long I don't know what what type of rent you are getting but if can get away without a wash dryer I would do so.Sometimes i might add an appliance as a convenience but I don't assume any liability for repairs.

Ah if we had a time machine.

When we moved out, we threw out the blinds and drapes (and replaced them); washed the walls several times with TSP; primed with two coats of Zinsser; and repainted the entire room.  

Anyone has insight if I should switch to having the tenants pay or keep their rents competitive to provide in-house washing and dryer?

I had concerns that one of the appliances will break down and the world would end, well in the first 2 years I had dishwashing machine and a washer breaking down.... and I just bought new ones from tenants CF over the years.