Romania and Poland aren't exactly small by European standards, in fact they're some of the biggest by population and area. And Romania is not Central but Eastern European [1], so that's out.
Small and Central European would be Hungary, Slovakia, Czechia, Austria, Slovenia, Switzerland based on the most widely used definition of Central Europe [1]
Depends, Romania is either central, southern, or east european. Culturally is most definitely not eastern. Germany is by some considered central european. Austria and Switzerland see themselves as west european. Oh the delusion.
Every country changes their belonging to a region based on the perceived value bias of what is being discussed.
A user here humorously put it that Slovenians see themselves as Western European when it comes to how honest and hard they work, Southern European when it comes to weather and food, and Eastern European when it comes to drinking, partying and having fun.
But geographical location however is immutable, so let's stick to that instead of the other more biased definitions.
I would probably not classify Poland as small, especially noting how big of a population drop between Poland and Romania is. And if Poland were a US state, it would rank 2nd in terms of population, sightly over 1 million people less than California...
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Small and Central European would be Hungary, Slovakia, Czechia, Austria, Slovenia, Switzerland based on the most widely used definition of Central Europe [1]
[1]https://en.wikipedia.org/wiki/Central_Europe#/media/File:Cen...