Paris is pretty bad. I was busting at the Austerlitz rail station, the only public toilet was pay to use and I had no cash and limited language ability. I ended

Paris is pretty bad. I was busting at the Austerlitz rail station, the only public toilet was pay to use and I had no cash and limited language ability. I ended up walking to a nearby McDonalds. London is very similar, what limited public bathrooms there are tend to be coin operated.