What a great concept - any night of the week of weekend (exept Tuesdays) there is this cozy little women's spa you can go to until midnight right in capitol hill. Hydrotherapy is great (Sauna, Steam Room, Hot Tub). The place is low key and benign and the lighting is just right so I always feel comfortable, not in anyway self conscioius.
What I like best about Hothouse is the energy and attitude of the place. Welcoming, friendly, no attitude. Nice scents in the air too - eucalyptus and lavender. Lastly, if you can get in for massage, it's worth it. Good therapists and again very warm and friendly.
Go to hothouse if you want to 'pamper' yourself without spending a fortune and without the attitude.
Pros: hours, staff, good prices
Cons: capital hill