Advice on new home network

We're renovating a house and I'm looking to add some smart home devices in the home. This gives me a perfect excuse to renew my current home network setup. I currently have a simple setup: my ISP router + an unmanaged 16port switch with 2 Unifi AC Pro APs (feed using PoE injectors). I want to give the 2 Unifi APs to friends of...