I think the title should be "teaching English to a Romanian".
I have many Romanian friends and a Romanian family who lodge with me.
The younger (under 35) generation have a pretty good understanding of English (From the TV...Romanian TV isn't dubbed so they hear lots of English and even more American) even though here we usually communicate in French.
Romanian is a Latin language close to Italian, not as some might imagine a Slavic one, so your French can help in communicating.
As for teaching English concentrate on simple concrete vocabulary that is immediately needed ..numbers colours household objects ..but I think you will be surprised how much is there already
The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd; indeed in view of the silliness of the majority of mankind, a widespread belief is more likely to be foolish than sensible.
- Bertrand Russell