I've looked at several hotels, both from the RS book and also from the Forum. I have jointed the tripster club hotel group that has locations all over Spain (on the advice of someone on the Forum).
They have 3 hotels in the central Madrid area, all starting with Petit Palace in their names. I went for the old historic one, Petit Palace Posada Del Piene (evidently the oldest hotel in Madrid). If anyone has any feedback on this selection vs other Petit Palace Hotels in the area, please let me know.
In Barcelona they have a Hotel called ICON BCN. Its a few blocks less central than the Midmost, which I had thought was also a good deal, however the ICON has king sized beds, or so they say. For a 5 night stay this is a major plus, as we really like that bigger mattress (husband is very tall). Again if anyone has anything good or bad about the Icon I'd like to know.
Our reservations are for October 2025 and I payed the extra for cancellation so I have plenty of time to change my mind.