We can either have 5 days in Barcelona (4 nights), 1 night & most of a day in Ronda, & 1 day in Sevilla (2nights)
or 4 days in Barcelona (3 nights) , a full day and 2 nights in Ronda & 2 days & 2 nights in Sevilla.
What are you thoughts?

It sounds like you're counting some o fyour days twice.

I love Andalusia nd wouls spend all of y time there and bag Barcelona. And, while Ronda is cute, IMHO Granada and Cordoba are much more worth a visit.

But - if you really want tosee Barcelona I would spend the whole time there and do a day trip or 2 - rather than spedning so much time hopping all over Spain.

Can you tour the "White Towns" of Andalusia as a long day trip from Seville? Would including Malaga and/or Marbella be pushing it? We would rent a car. Not sure about driving distances and if the mountain driving is tough.

With only 7 nights for your entire trip I'd stick to Catalonia. I'd spend at least 4-5 nights in Barcelona and then a couple of nights in Girona or along the coast (depending on the time of the year). You could easily sped the entire time in Barcelona doing a couple of daytrips. Trying to visit Barcelona and a couple of cities in Andalucia in 7 nights is extremely ambitious.

I would stick to Catalunya, but

If you wish, you could fly to Seville ( Vueling is cheap)
for 2 night. leave Barcelona early , come back late. Forget Ronda. Or visit Valencia for 2 days - train from Barcelona (3 hours).

I should have ben clearer, this is only a part of a 5 week trip.
Danon, why would you skip Ronda, it get high praises.

So, do you only have 4 nights in Andalucia?
If so, I'd spend all 4 in Sevilla and skip Ronda. This would give you an adequate amount of time to visit Sevilla and do a daytrip to Cordoba.

I said to skip Ronda because of time constrains.