She was not at home so I don't know if she actually saw water dripping or it is a stain (we don't know how it stained) on the ceiling??

He does not own massive amounts of material for the wood to make the cabinets or the stain/colorant colors and finish.

I also like the speciality paint store (where I go Ben Moore, for example) just for  consistent service and expertise (hit or miss at the big box there).Then hard to beat the old school prep with tsp and  a good sponge mop (just damp) and rinse with clean water (damps sponge mop)...and primer for major color changes or spots  and stains..The good paint in luster you can clean also makes turnarounds easy...clean the walls (as mentioned) and you may only have to touch up..Finally, if you can go with one color/brand for the interiors of your rentals you will save time trying to match color or organize endless paints in your garage...best of luck

Well, the trim is stained wood in all my rentals.