I think Italy closely followed by Spain are the favoured locations for Romanians moving within the EU.They have had the right since 2007 in at least 19 EU states that did not impose any type of 'transitional measures' .
Th Uk did impose them & they were only lifted on 1st January 2014
They have always been the largest group in spain,who did not impose any transistional measures. Think it is around 1million+? by far the largest nationality of foreigners in spain.
It's probably a language thing, Romanian is a Latin based language, closely related to Italian.