Our stay at Cat's was very pleasant. The appartments is rather small, but perfect for two travellers for a few days. It is very close to Gare du Nord and a metro station which makes transport very easy, and it's only a short 10 min walk into Montmartre. The neighbourhood was a tad sketchy at night, but no one ever bothered us, and we were accustomed to it by the end of the trip! Overall, a lovely stay, and Cat was a pleasant host who was very easy to communicate with. Thanks!!