I don't like to tar an entire nation with the same brush, but having heard of numerous bad experiences with Romanian escorts from others, and a couple of my own less than positive experiences, I tend to avoid fucking them. There is a strong criminal culture associated with Romania, which filters its way into punting through pimps controlling prostitution for financial gain. There are notable exceptions and some of the girls are gorgeous.
My preference is Polish escorts, where I rarely have a bad experience, but I also frequently punt with Hungarians, where I find there is a massive difference between them and Romanians, but I apply a more strict criteria when punting with Hungarians, as they too often have controlling forces at work, especially in certain areas of London and that has the potential to affect the service.