I was unaware that the person was an older Caucasian with a younger Dominican girlfriend .. but I think that he would be less noticeable and safer if he stayed at Bayahibe where there are many gua guas and moto conchos and a beach and good cheap restaurants. La Romana, like San Pedro and Higuey, is not a tourist town but people living in Bayahibe go to La Romana for the shopping at the numerous supermercados .
The problem is Bayahibe is completely incovenient for the chica and for him. She has to go back and forth to La Romana. It is 30 km. (I don't know how she gets to work in Punta Cana.) The older Caucasian does not have a car. So, she will be taking the gua gua back and forth from Bayahibe to La Romana. She might be used to it, but not the lifestyle she aspires to with the affluent gringo. And, for him
He is not going to be taking the gua gua to La Romana. Just picture it - small gua gua/van literally often packed with people. This guy has no clue. So, he has to take a taxi. Generally, they want $40 usd.
Also, Buena Vista Norte. As you say, no public transportation to speak of. He has the same problem. He needs a car. Decent area but inconvenient in his circumstance. And, the chica doesn't want to be there. It is too far from everything she knows and needs.
He has ignored the chica's request to live in Orquidea. That's what would work. And, he ignores her. Orquidea is a decent middle class Dominican neighborhood. Many good houses. It is what she aspires to. And, good for her. She knows what she wants. And, a place near the ruta could be found. But, as with all else, he ignores good advice and good ideas. That is why I am staying out of this discussion. For the most part. I even ignored the bad advice steering him to Caleta. Or Vista Catalina. Sketchy neighborhoods. For the most part, not a place for him.
The older Caucasian has no idea what he is getting into. In spite of months of good advice from people who know the reality of all it.
Just my two cents.
(I have lived in La Romana and Punta Cana for more than 10 years.)