Personally I give each character a face, either from a person I know who matches their personality or a celebrity that fits the description, even though sometimes it can be really annoying if the author gives more details on the persons appearance and my character doesn’t fit that lol. I’m very curious as to what other people do.
Same, and I usually have very vivid pictures in my head of locations / houses.
Maybe it’s intentional so that i don’t get too disappointed if there ends up being a movie / tv adaptation or