While El Palacio felt almost like a ghost town (or ghost pizza place, if you will) when I was there, it was amazing how much the atmosphere can change just a few feet (okay, meters) away. Las Cuartetas was packed. The front room, which held some 50 people, was full and the back room had another 20-30 people in it -- mostly young college aged pizza eaters. The pizza place is located on Avenue Corrientes, as were El Palacio and Banchero, but this is the closest place to the famous Obelisk -- a major traffic hub, especially among tourists. So I imagine if someone was in the area and looking for the closest pizza place, there's a good chance they'd end up at Las Cuartetas as opposed to one of the many other pizza places located a short distance away.
Although not quite as bad as Banchero, Las Cuartetas was nothing to be desired. I had the same problem with my fugazetta slice -- it wouldn't stay together. It was definitely inedible without a knife and fork and tasted more like some melted cheese on a piece of dry toast. At least it was warm.
I was thinking of constructing a short concluding paragraph about my Buenos Aires pizza eating experience (as I think I've mentioned, El Cuartito was my favorite place and a not to miss stop for any pizza lover), but I'd rather just end my four part recap on that note.
So good night... and good luck!