The problem is that in Polish they do not have an equivalent word for 'home' as we understand it.
It does and this equivalent is 'dom'. The noun 'dom' has several meanings in Polish, but the two principal ones correspond exactly to the English (1) 'house' and (2) 'home'. When I want to say that I was away from home yesterday, I will say 'Nie było mnie wczoraj w domu' even if I live in a flat.
A rough equivalent for the English 'home sweet home' may be the Polish phrase 'domowe pielesza', but that definitely isn't appropriate as a sign to hang above the fireplace mantle. A nice Polish expression describing reverence to your guests is "Gość w dom, Bóg w dom".