I've been here quite a few times, as it's very close to where I work, and the early morning hours are perfect for me.
Like most other KMPs I've been to, I never go in looking for model type material. This place stands out as a damned fine shower and massage, and when I go, I'm generally happy to get exactly that.
The first time or two, I got the "you do" act. That's not my thing, so I went with "nah, I'm okay". Left a $40 tip for an excellent massage, and was remembered. When I go now, there is no more "you do" - I get the happy ending.
I'm not normally a patient person, and as I said, the women aren't gorgeous, or young...but if you play your cards right, it can happen. If I can find another place close by with early morning hours, I'll go there, but Cosmos is a good, solid Plan B.
By the way, the other places nearby with early morning hours that I have found are Gado (also on 36th), and Tropic Spa, which I think is on 5th, either at 31st or 29th. Tropic has FS if that's what you're after, usually with a younger girl (last time, she was quite attractive, and the price wasn't half bad), or sometimes with Mamasan "Lucky" (not very attractive, but amazingly nice boobs, and super negotiable on FS).