I agree with others inasmuch as ask around for personal recommendations.
Otherwise, in your position i would consider going to a Cleaning Company/Agency. They are well used to adhoc requests. You will be able to state what you want (and what you don't) and be able to say you will supply your own cleaning products and materials due to allergies. With a company you are in a position of being able to increase/decrease frequency and if someone doesn't 'suit' or doesn't do what you have asked (within reason of course) you can give this feedback. Plus there is the reassurance of the individuals of being insured and DBS checked.
To start having someone in your home is daunting and I hope you find the right person to help, Good luck.
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. When OH does things, he's happy for me to say use this cloth or do it like this or whatever - because he wouldn't know what was what otherwise. He does do all the hoovering.