Before I moved to Vegas, I stayed at the
Extended Stay of America quite a bit. Great location close to the Palms, the Rio,the North Valet entrance of the Bellagio, and to the strip.
The rooms are like little studios, a sitting room with couch and tv, kitchenette with full size fridge along one wall, then a door to separate bedroom with bath. The sitting room has a pull out sofa so you could actually split it with someone if you were on a budget or not bring the girlfriend/wife with you.
I would try to book ahead though, I'm sure other people know about the great location for the WSOP also.
Jason