I am not going to give studio or auditorium setup tips here because that is a different ball game. Been there.
These are just my personal average bedroom and living meets hi-fi with wife acceptance factor tips and I am aware some will shoot at this from a studio or auditorium measure. Anyway..
1. Make the speakers blend in, as in search for colors or materials that match the rest of your furniture and schemes, and leave "breathing space". Loudspeakers are part of the picture. Don't cram things.
2. Dampen reverb with stuff. A carpet, curtains,furniture, huge plants. All help in some degree.
3.Always leave a comfortable central listening position. There should be a space to beam the stereo image well that is also comfortable to position yourself into.
3. "Always" get the loudspeakers that 'you' want to have and feel a certain emotional connection to. It is far more important to listen to a sound you prefer most and look at a design you love to look at for the upcoming decades instead of letting a set of guidelines dictate that you need something the room needs.
I mean, my local dealer could give me a tailored set of model x speakers because it would match on paper, but in that case a set of arbitrary conditions and the dealer would have chosen them, not me. The risk I get bored of the set and replace them earlier is great news for the dealer, but not for me.
I have, by pure opportunity auditioned 5 different kind of loudspeakers in our bedroom. I had an amazing small bookshelf model that felt bigger than it was. But then placed a larger model there and between something that feels larger and "is" larger is a difference which for hi-fi definitely is a huge plus in presence in larger models for me personally. I never play at ear shattering volumes, always low in the late evening and just at comfortable louder volumes normally.
I also tried my quite large 3 way standmounts in the same bedroom and it was still like being in front of a stage. Something that is great at its core is not suddenly beaten in its own way by a smaller model, just because it fits a smaller model in a smaller room theory.