I've been a few times to rooftop saunas. Until my last time I've loved it but I have to say it's not as good as it used to be - the curtain/doors to each cabin have been removed so you don't have the feleing of your own space anymore. It also means it's not clear what is your space and someone walked into our cabin to grab a drink, understandably thinking they were for everyone (they were booked on the express sauna so didn't have access to their own). It was a bit awkward for everyone and could've been avoided. Also not all the plug pools were filled so there was no space for us and we had to go and find someone and ask them to fill the one outside our cabin.