Oh, boy. I just spent all kinds of time on this post, and got timed out and the post lost. Anyway, I posted on this question earlier, but have given some thought to the ideal place.
The dedicated Enema Room would have:
Enough room for a double bed sized bench/table/bed, with a nice, smooth padded waterproof cover(Latex rubber, maybe?), accessible from both sides.
A big sink like the old porcelain kitchen sinks with sloping drain boards and two basins, one for soiled, used equipment, and the other for washed, clean stuff, and a big, high faucet spout for filling bags.
A toilet with an elongated bowl, and lots of room around it.
A heated ceramic nonslip tile floor with floor drain for easy washing.
Ceramic wall tile wainscoting, at least around the toilet.
Plenty of drawer space to house nozzles, connectors, tubes and tubing, bags, etc., all spread out and readily accessible
Good ventilation.
Radiant heat in the ceiling.
Good lighting.
Mirrors on all the walls.
Hooks all around the walls.
Paper towel dispensers strategically located.
A large shower, 3x4 feet or larger.
Water heater nearby for a quick supply of hot water.
Hmm--guess that's all, unless you have some suggestions.