I stayed for a month and it was perfect for me, the apartment is lovely and nowhere is more than 15 min walk away, the cathedral and bars, restaurants etc are less than 10 mins walk. One thing to note is it can be noisy in the bedroom at night if people are in the apartment next door or it’s busy on the street so bring earplugs if you’re a light sleeper. I plan to come back to Seville later in the year and would be happy to book again.