Small bathroom in a small Manhattan apartment, but at least it's bigger than my last apartment.
The enlarger rolls on a typewriter table (remember them?) and slides in over the toilet. Trays go in the bathtub. Daylight tanks I can do on the sink. Chemicals are kept in plastic crates in a different room, out of the way, under a bench. I keep some paper out that I'm using, and the rest is in the fridge.
I've had a permanent darkroom in the past and would prefer it, but it's not happening any time soon.
I can print easily up to 11x14" from 35mm to 4x5" (or contact printing 8x10" or 11x14") with this arrangement, and that suits the kind of printing I've been doing anyway lately. I could go to 16x20" in a pinch, and could rent darkroom space to print larger or to enlarge from 8x10".