Someone gave me a great tip which sounds dead trendy and I think I would prefer this than a tent/cubicle/curtain
Acrylic/Perspex sheets on the walls in the two corners, sealed with silicone and with the cappings to cover the screws..... you would still see the paint/wallpaper behind the clear acrylic/perspex and they would just wipe clean no problems!!!
MUCH cheaper, easier... and trendier.. and then the room can STILL be used for other treatments without spending ages setting up/taking down etc etc etc... as it would just be there on the walls!!!