If I had the space and the money for one, I'd be delighted to have a Papa piano. Or a Mama piano. Or even a baby piano.
Still, I wouldn't want anything under 5', and I'd prefer one in the 5'6" to 5'10" range. That's 168 cm to 178 cm.
Those are a good size, they sound better than the baby baby pianos, and they are much more affordable than pianos 6' and up.
Alas, I'll likely be stuck with baby digital for life.