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raybo has a good point (i.e. language).
My preference would go towards France (I speak French fluently, have family there). If you do not speak French, you may want to consider Germany. While France has plenty of quiet country roads, Germany has (the best?) bike paths network. We cycled extensively both countries. Both are great cycling destinations. We are also familiar with Italy and Spain. Spain during summer can be *really* hot. Italy will test your legs (hilly). But great destinations nonetheless. You cannot go wrong, with the COVID caveat that'll motivate you to check conditions. I think I've read that Italy is reconsidering its open-border approach. Same in France. Situation in flux in Catalonia where nobody seem to know what is happening exactly.... Mixed reports from what I hear, with some tourists marvelling at sites that would otherwise be overcrowded. Interesting