Well Sciencegril, nice to see your name again.
Paris, London, Barcelona or Dublin?
All the recent negativity with tourism and crime pretty much took its toll on me, so I would scratch Barcelona off the list. Shame too because it looks beautiful and interesting. But for the wather, not half bad: https://world-weather.info/forecast/spain/barcelona/april-2024/ - but do look at several years for a recent average.
For Dublin I would need to do a lot of research and be convinced. I am not too worried about the weather in March or
April. It will be what it will be and I can always adapt. Here are the actuals temps in April this year .... not bad actually. https://world-weather.info/forecast/ireland/dublin/april-2024/
London, I enjoy London enough to put up with the language problems. You would think that you could find as many people in London that speak good Engish as you can in Budpaest, but noooooooo..... Okay, Ireland is worse, but it is supposed to be so I forgive it.
Paris? Always enjoyable. Any time of the year. A favorite place for me. https://world-weather.info/forecast/france/paris/april-2024/ Paris or London would be my first choice.
But since you are totally open minded about where, one final consideration might be cost. Not that one costs too much, but one might allow you to spend more on the nices stuff than the others do.
A lot of sites like this one have suffered inaccuracies if for no other reason the recent inflationary trends and generally from a lack of data. BUT, for rank order and a sort of starting place or maybe add 15% to each. https://www.budgetyourtrip.com/europe
Dublin: On average, budget travelers spend $75 (€69) per day, mid-range travelers spend $196 (€179) per day, and luxury travelers spend around $535 (€490) per day. These costs are calculated from the expenses of previous travelers to Dublin.
Spain: On average, budget travelers spend $76 (€70) per day, mid-range travelers spend $199 (€183) per day, and luxury travelers spend around $538 (€493) per day. These costs are calculated from the expenses of previous travelers to Barcelona. (but Barcelona has begun cracking down on short term rentals and intitiating other measures to drive up prices to limit tourism, these number are probably somewhat low because of all of that)
London: On average, budget travelers spend $106 (£81) per day, mid-range travelers spend $283 (£217) per day, and luxury travelers spend around $805 (£617) per day. These costs are calculated from the expenses of previous travelers to London.
Paris: On average, budget travelers spend $107 (€98) per day, mid-range travelers spend $287 (€262) per day, and luxury travelers spend around $817 (€748) per day. These costs are calculated from the expenses of previous travelers to Paris.
And as a benchmark, since you were just here:
Budapest: On average, budget travelers spend $35 (Ft12,501) per day, mid-range travelers spend $93 (Ft32,957) per day, and luxury travelers spend around $256 (Ft90,920) per day. These costs are calculated from the expenses of previous travelers to Budapest.
So Dublin and Barcelona will be closer to the cost of a holiday as you had here.
Paris is the city most like Budapest in atmosphere and beauty.