When to go
Best time
Morning, Mid-day, Late afternoon, Sunset, Night
All months of the year are suitable to photograph the underground restrooms of the Wintergarten Theater.
To find the restroom with fewer guests, visit during midday before a show. Otherwise, you can visit during opening hours.
Field tips
This restroom is public, but it's still considered a private location. Please ask the staff before you take any photos and make sure that there aren't people (other than your model) in your shot. I suggest tipping the bathroom attendant, too.
Enhance the height of the arches by having your model get low. As the model is crouched down, the arches will appear taller. You can get low also, as the photographer.
Placing your model in the center of your shot will create a sense of symmetry, contrasting with the asymmetrical pattern of the arches.