That's great. Chickens can be very fussy creatures and like us, new is scary.:p
I think they'll be fine in the run for a couple of weeks while you take a holiday.
One other thing that I can't see in the pictures is a skirt dug into the ground around the outside of the run.
This is actually very...
Your coop is fine.
Your run is a better size than many I see here.
A lot depends on how you intend to use the coop and run.
If your chickens were to spend a considerable amount of time locked in the coop then yes, much more space would be better.
You write that you free range them 'sometimes'...