I'm in a dilemma on where I will be putting it, I have a full 9.2.2 home theater setup in my living room, so for sound I won't need it there but I do spend a lot of time in that room. The kitchen is right next to it, which is the second most used room (I love my food lol) so it would be easier to control my lights, locks, switches and blinds. On top of reminders, calendar, messages, and timers etc. Hopefully I can be in either room and control the HomePod. The next idea I had was in my bedroom, I'm only there when getting ready for work and when going to bed. When I get ready for work I like to listen to some music so I fire up the Apple TV and listen to some Apple Music, I don't have a soundbar so the TV speakers aren't great at all. So for the bedroom it would be for the sound quality more than anything.
I just can't figure out where it would be the most useful, I'm thinking the kitchen, the side closest to the living room so I can use it in whichever room I'm in.