When leaving hotels, I always take a businescard with me so I can get back. Careful, their businesscards have about 5 hotels on it, so late at night, my taxi drivers kept taking me to the wrong one. Sure, I told them the one near the Austerlitz trainstation, but I don't speak French and they don't often speak english. I thought they understood me, but when I kept arriving to the wrong hotel, I realized they didn't. The taxi drive got very expensive, long, and frustrating...