It’s hard to find a way in this maze and I did not “visit” all rooms, but yes there are at least 2 HP’s: a 97 and a 17bII
Thank you for that link! I enjoyed a lot this virtual tour.
I've found also: 71B, 16C, 29C, 35, 41, 48G (or GX?), 49G and 85. They are scattered in several rooms.
Of course there is also a lot of very interesting stuff!