Anonymous
Bring your own lock and a towel. They have showers, and the pool area has a hot tub and dry sauna, too. It's very well lit.
If you choose the monthly membership option you have access to the gym and classes which are extensive - the gym is superb. Car parking is 300NIS a month in the lot beside the Y. If you don't pay, street parking is around but - it's Jerusalem, so good luck.