That is a nice space. Have you thought about a make-up table with a nice counter, good lighting and mirror? Seems that accommodations, even many hotels, lack a place to set-out all the items one takes with when traveling and it is a mess having to continually locate things in a travel case.

Outlets for blow dryer, curling iron.

A large medicine cabinet or dedicated drawer with items guests may have forgotten such as new tooth brushes, personal shampoo, aspirin etc.

Train rack for extra towels.

Hope it turns out nicely.

Thank you fnmroberts for your suggestions--we're taking all into consideration; train rack is a great idea. Lots of work but glad to have a guest bath in the house.

How about a free-standing armoire? We were thinking about more cabinets but they turned out to be cost prohibitive. I found this at a moving sale.