Ok, I'll clarify what I had in mind.
My girlfriend who's native english is about to move to Rzeszów in a near future. She's a teacher, has a CELTA accreditation and provides ESL and private tuition (also for polish living in UK).
I'd like to ask if finding a job as a native english teacher or giving private english lessons here in Rzeszów would be a big problem / would provide reasonable income.
Thank you a lot for all your answers.