I think one of the main problems is that your husband is home.
Just mention he'll be out of the way when the nanny's in charge.
And also, while he's home that doesn't mean she can't go out while the baby's napping. The children have to remain her sole responsability at all times. No sane nanny will want to work alongside a daddy, even if I'm sure your husband is a nice person
The rate might be on the lower end but what you could do is offer the nanny lunches and snacks when at your place.
I know I would have agreed to this kind of job when I was younger, good luck !