Amazon swords, crypts, java fern, java moss are common go to low demand plants.
Low maintenence. I find crypts and java fern grow like weeds and need a good trimming/leaf removal monthly. I dont know what you consider low maintenance.
What looks nice is personal opinion too. Amazon swords will give you some height. Crypts a little colour. Java ferns are good for filling space.
200 litre low tech planted community tank.