Honestly I haven’t read City–I’m going completely off of my experience with Nichijou. I would expect in the IBC we’d read a volume in just a few weeks as opposed to the BBC’s 10 though, which would add to the intermediate-ness. Even though the content was difficult at times in Nichijou, it still wasn’t very time consuming because there were a ton of visual gags and not many long written passages. Honestly any manga would probably be a little bit on the easier side compared to the books this club typically reads (which I don’t think is such a bad thing for a brief interlude at least).
For a bit more discussion and a few more perspectives on the difficulty check out the end-of-volume thread.
Also, it does indeed look cute as heck.