Not positive, but I think it was only in the master. I had a heck of a time getting answers to these questions, even when I called OKW directly - even there I had a tough time with people even knowing how many there were. But they do guarantee H/A, so at least we won't be surprised that way.
My Dad's disease is progressive so we're not sure if he'll be completely unable to walk by then. He's still talking about going upstairs to sleep (they want my husband and I to have the master because of the space) and I don't think that will happen or that we'd let him anyway because I don't want him to fall, but if he dose end up upstairs somehow, he'd just take showers in our shower, and we'd use the hall shower downstairs.
That was way more info than you asked for, or course, but the impression I was given was that there was only one roll-in shower, and absolutely, the upstairs was not wheelchair accessible.
At SSR the GV's are accessible on the second floor if you leave the unit, take the building elevator up, and re-enter the unit on it's second floor - there is another door. But we didn't have that many points, so here we are, and I don't know if the showers are roll-in on the second floor or not. And frankly, I read so many good things about OKW, I'm excited to try it, especially in a GV.