Understanding why establishments that offer private shower find it so important to clearly display photos with captions. Some travellers only want to shower and not bath.
It is generally understood that bathrooms are en-suite and if not exclusive use of bathroom facilities, including shower, per room must be clearly understood by traveller.
Also there are some travellers who will need grab handles and seat for safe and dignified shower facilities.
A spotlessly clean bathroom, with plenty of toiletries , is also one of your best marketing features