Hi Martin!
Well, what a wonderful (but not totally unexpected!!!) surprise!
I think the only thing I would be aware/slightly wary of is that the dynamic will change within your household. At the moment, when Irina's not there, you're top-dog (as it were!). You are her be-all and end-all - that may alter.
Also (as I've witnessed with Harry + my daughter's dog) all's wonderful while that dog is the visitor - but when he stays it's a completely different way of life.
Good luck to you all
xx