I am so jealous of this! My option at work is the men's bathroom - because we are a floor of almost all women. We typically put an "Out of Order" sign on the door while it's in use, but there is no lock or protection of privacy.
I can't share a photo of where I used to pump because... A) my office moved to another building, and B) I would have no clue or way of getting a pic from my phone onto this website I using from my desktop at work.
First place was a bathroom, one stall, so we could lock the door and it had a counter with enough room for a chair. I didn't mind it, but it was a bit cold so I always made sure to have a button-up cardigan and knit gloves! I shared with another person, but it was also a regular bathroom. I didn't mind it, but when a supervisor started having to use it as well she refused to use the bathroom.
So we moved to an old training room that was being used as a storage room. Later they changed into a conference room, but we were still able to use we just had to actually schedule it so no one would schedule a meeting in there. The door locked and the one small window in the door we covered with a piece of paper. Sometimes people would not look at the schedule and pop in there for a little talk with an employee, or a meeting would run late, and that was a pain.
A couple times I had to use a different conference room because they were having a big client luncheon or something, but none of the other conference rooms locked and they have windows. I would stick a chair behind the door,a sign on the front of the door, and made sure all the blinds were shut tight, trying to face a wall just in case, lol. Oh fun times.......