Do read this great essay by Elliot Colla on buying (and reading, and discussing) books in Cairo, over the span of many decades.
When you go into Dar Merit, you will be asked whether you would drink coffee or tea. If you stay long enough two things will happen. First, Muhammad will roll a fat joint and pass it to you. Second, back in those days, the great Egyptian poet Ahmad Fouad Negm would probably come over around nightfall for an impromptu literary salon. I count myself very fortunate that those two things happened to me as often as I wanted that summer.
In January 2011, Dar Merit became something of a forward base of operations for young revolutionaries. Any poet or critic or artist or singer or stagehand who needed tea and a place to rest would find it at Dar Merit. Were it not for Dar Merit, we might not have any serious literary accounts of the 2011 uprising. In recent months, Mohammad Hashem has spoken about moving away from Egypt for good.
I have similar fond memories of Dar Merit, where I was always seemingly welcome to drop in. (Which was all the more gracious as often when Ustez Mohammad arrived there in the late afternoon I had the distinct impression that this was the beginning of his day. He once called a friend and writer I was meeting at his office and told him: "Hurry up! There's a khawaga here you wants to give you tons of money!" Followed by a wild cackle). As for the Cairo Book Fair, I visited last year for the first time in a long time and wrote this.