Just published a free slice of my isometric classroom asset pack: student desk + chair in all 4 facings, plus wall/door/floor pieces to actually build a room. 64x64 transparent PNGs on a shared 2:1 grid, commercial use OK, no attribution required.
There's also a paid 32-object version — lockers, teacher's desk, aquarium, etc. — linked on the download page if you want more.