This is obviously a matter of taste and i'm sure that there are ways to fit most store items into different houses across Tibia :)
But do you want to know what frustrate me the most? When theres an item that you think looks good so you end up buying it and then when you unwrap it in-game it turns out that it wasn't as amazing as you thought!
Take the magnificent trunk for example, yes indeed it looks pretty magnificent as you can see in picture (1) But then hey.. see what happens when you want to place an item ontop of it in picture (2)? It doesn't match at all! So the only way to make it look somewhat better is to rotate it as shown in picture (3), then it looks somewhat okay in picture (4), even though its facing backwards!

So yeah... the items like these are the worst to me atleast.. the ones you think looks amazing but end up letting you down/regretting buying them.