The tricky bit is finding one that can switch between espresso and filter. If you just want espresso, there’s a few options. People really rate the Eureka Mignon.
Yup, I've got the base level Mignon. Hardly ever use it for espresso anymore but it's easy to move the burrs when I need to. I bought an Etsy single dose bellows kit, much nicer than the OEM option which just looks daft to my eyes.
I really like mine, but agree here. Tempted to get a Niche Zero, but they're so expensive. Is there a decent single does grinder that's not £500?