Spain Couples Vacation Review, Madrid, Sevilla, Arcos de la Frontera, Marbella

There are only 3 things I might have done differently, although none could have been predicted ahead of time. So, these comments are more about future trips than this one:
1. The rental car company tried to down-sell then up-sell us when we arrived at their site in Sevilla...plus sell us additional insurance...during a very long process. We ended up with only one of the 2 VW SUV's reserved...plus an Audi sedan. In the end, these vehicles worked very well for us, but we should receive a credit / refund for the 2nd smaller vehicle. Hence, I probably would use a rental car company next time that is associated with our preferred global companies.
2. The tour and sailboat reserved in Marbella was the only low point of our trip...the travel company helped mitigate the problem as it occured but, as advised them, this boat/tour should not be used again in our opinion.
3. This was our first trip to Marbella. This beach hotel was enjoyable especially with the penthouse rooms and private rooftop hot tubs. And, our guests enjoyed walking the beach and sitting at the hotel's beach club. However, the other hotel in Marbella was not at the same level as our other prior locations...the 3 hotel rooms were not close together, and one room was a modern style with no closets and tiny floor space. In the end, Marbella is not a place to which we would return. Hindsight being what it is, I guess we should have selected a different beach location and/or hotel.