Inside the home you can usually get away just using the internal link local addresses. E.g. my main PC is fe80::10, my wife's pc is fe80::11, my router is fe80::. You can even use that when you get "fancy" e.g. my NAS is fe80::12 internally or ${public_prefix}::12 "externally" (that one actually works on either side).
This address will also run afoul with the "privacy first" randomizations on most devices by default. This addition is truly the scourge of letting IPv6 seem dead simple to use.
This address will also run afoul with the "privacy first" randomizations on most devices by default. This addition is truly the scourge of letting IPv6 seem dead simple to use.