I absolutely love the rooms here at the 41st professional building where I work. We have two rooms located on the second floor and one over on the NW clinic. For me, I only have to walk downstairs to use one of the rooms since I work on the third floor. You don't even have to carry your breast pump around since there is a medical grade (Medela) pump provided in both the rooms with a sink and a nice rocking chair. The only thing that bugged me at the beginning was that the Epic training was in that location and you never knew if there was a room open because you can't schedule it in advance but rather use the white board on what time you would be done with pumping (which some people even forget to add). I think if there would be an option to schedule the rooms it would be a lot easier and I wouldn't have had to walk the stairs multiple times a day in order to not use any more of my work time than I already had.
But all in all it is great. At my old job I had to use a meeting room and had to add Cardboard boxes in front of the windows (Not very comfortable).