There's a lot of great info here about psychiatric inpatient treatment. However, since you're going for, basically, detox, I wonder if a regular straight-up hospital wouldn't be better, and a bit more liberal in allowing you niceties. Or a specific detox clinic.

I honestly have no idea whatsoever if that's feasible, or even appropriate, but the other thing is, you know, maybe the psych place'll be good for you. Slip sounds like (s)he had excellent results with group, despite some reservations at first, but 6 weeks is a lot different from 5 days. Ironically, I'd go nuts after 5 days with no music :P I wonder if they'd let you bring a gameboy or a boombox.

Keep us posted on your decision, ok?