this is mew, just after the part, right before falling asleep next to @DemonNova in one of the worst hotels we have yet stayed at — no controls for heating (it was too warm), the window didn't fully close, water collected on it in the morning and started dripping down onto the bed, there were no blinds/curtains/whatever, the tap water tasted pretty bad, …
Time on the train towards Berlin was used to finally create a first draft for the overdue update to my safeword + "traffic lights" system. It still needs some refinement and proper spelling out of some stuff … but the direction feels good. 
(Over the last few years, a lot of our limits and the things we are interested in changed. Play is getting closer to often not quite known limits, which themselves can be played with in some settings … which needs some more nuance. And I had to learn that a few expressions (like "red") tend to be reserved as hard safewords at events … which was so far dealt with by swapping "red" for "pink". But having to think about the current context before saying something kinda sucks, so it should be taken into account for the general design.)
edit: oh, forgot the Berlin transport rant …
We waited over half an hour for a bus. In that time, three of them should've come by.
When the first finally did, we were already too late for the party. And we got thrown out of it and had to transfer into the seconds one only a few stations later.
We effectively had not chance to know any of this in advance … otherwise a ten minute walk and another bus would've easily saved us from being late. 