Barcelona or Rome? Any advice?

I want to go on a holiday for 3-4 days in a sunny city in Europe! I live in Cologne, and am in dire need of ☀️⛱️!

Should I plan to a trip to Barcelona/Madrid/basque region or to Rome/Florence/Amalfi? Or any other country works as well!

Any recommendations? I'm visiting with my mother in law! So some nice place to chill! Not really looking for party scenes... We just want to sight see and walk around. Eat local cuisine and enjoy the sun!

Thank you so much!!! 🍹