I have actually been a student at UNIS since this new campus first opened up. The showers didn' come till a few years later so they are a huge improvement to the school what with all of the sports facilities (tennis courts, bball, soccer fields, swimming).
The showers, toilets, changingroom are all under the same roof. I must say that it can get really smelly in there due to lack of cleanliness of the toilets and the floors are usually not cleaned well which makes it unpleasant.
There are wall fans in the changing area which is nice, although on very hot days they don't seem to make a difference. Overall, these showers are very high standards in Hanoi.