All seville tours. : https://allsevillaguides.com/en/
We travelled to Spain last week. we use private tours in Barcelona 2 different guides 2 in Madrid and booked this company in Seville based on Rick Steves recommendation. On their site they guarantee and "English spoken fluently and clearly" Susanna the guide listed on the site and the book was not our guide. On the day before the tour she informed us someone other than her would be leading. Our guide DID NOT speak English fluently or clearly. My wife and I both speak Spanish our 2 friend do not. Thus we requested English speaking guide. We spent a brutal 6 hours listening to our guide struggle with English words and and accent so thick we only understood 50% of her words. We contacted Susanna and she refused to refund any of our money because we "tipped" and her guide" officially licensed English " guide. We tipped because we know this is their livelihood. The site did not contactually provide a fluent and understandable guide.
Be warned for $500 you can do better. We had 6 lovely guides in Spain that really did speak English fluently and even though everyone has an accent as expected easily understandable.
In addition she would not return any further emails after initially declining any refund despite me pointing out her website guarantees. Poor business ethics and integrity. She is full aware of this guides limitations.