I don't think that there is anything wrong with working for the same firm as a spouse, but I personally would prefer not to be in the same area/office.

As for him putting a word in, I'm sorry, but I personally think that is an absolute no-no. If you are well qualified and have the right experience for the role, then you should get it on merit alone. Your OH rightly should remain absolutely neutral on the matter.

If anything, I would think that any "word" could have a negative effect.

Just my personal opinion!