I had one of these in my last apartment! This was the model I had.

It was a total game-changer. I also bought a showerhead splitter, and one of these quick disconnects for a garden hose. I believe I also had an adapter or two to change the showerhead diameter to GHT ("garden hose thread").

Then when I'd want to wash clothes, I'd just put the washer unit into the tub, take out the hose (which I stored inside the washer when not in use), and attach it to the showerhead splitter's diverter arm. The quick-disconnect made this much easier than manually screwing down the hose every time.

I just manually filled up the basin with water by standing there with the hose, rather than attaching the hose to the fittings on the machine, because I never really found a good way to attach the hose to those weird unthreaded plastic inlets.

No other equipment was needed, as the unit would just drain through an attached hose into the tub.

After the spin-dryer was done, we'd hang the clothes on portable drying racks.