The strongest contenders for me would be Ireland or Spain.
My employer does remote work and they have their European HQ in Dublin. That combined with everyone speaking english seems close to ideal in terms of logistics.
As for Spain, they have a special Digital Nomad visa for remote workers, my wife and I took Spanish in high school, and my dad lives in Barcelona after having retired, due to the lower cost of living/healthcare, and also because his sister, my aunt, lives there too.