You will need to find out what diseases are endemic in Romania that are not present here, as your vet may not be expecting them if she/he presents with certain symptoms.
Is rabies present in Romania? What about Leish?
Strays in Romania have often come from backgrounds of great cruelty and neglect - have you experience in the physical and mental issues this may give the dog?
I have to say while I happily support spay/neuter/shelter programmes in other countries, there's no shortage of dogs (many at risk of PTS in pounds) to adopt in the UK.
Are you being provided with rescue support/backup? What happens if the dog does turn out to have behavioural issues or you can't keep it for any reason?
I ask this because we are currently fostering two dogs who were adopted by a lady some six years ago - unfortunately she is currently very ill in hospital. If no rescue support available, these dogs would have ended up in the pound, probably separated, and at their age would have been unlikely to have found homes. None of us can plan the future which is why adopting from a British rescue can give this peace of mind.
If no backup in place, then what happens? Will British rescue be left to pick up the pieces, possibly for a dog with multiple and severe health or behavioural problems?