I like keypads. On a rental you can change them when tenants change. At home you can go out with keys or phone. Though it stands to reason you could put a keypad outside and run a wire inside, or use wireless though personally I'm glad my keypad lock isn't smart or wireless.

Keypads are good, especially for higher end rentals. Another lower tech (and probably more secure TBH) option is small format interchangeable core (SFIC) locks where the core can easily and cheaply be swapped out between tenants. Landlordlocks.com built a business selling this concept to landlords. I’m only jealous I didn’t think of it first :)

So euro cylinders?

yeh regular key lock in the door, electronic cam release of the for latch in the frame seems like a much more robust set-up. seal the gadgets in the wall on the inside of the room, no batteries or moving cables.