I also have a recommendation. For the past 3 months I have been enjoying live tours on a new platform ( viewpal.com ) that offers live streamed tours from expert tour guides that are free to join and tip-supported. There is a chat to ask any question you might have and even a camera function to take a snapshot as a souvenir.
There are many categories and all the thematic tours you can imagine! Viewpal seems to be doing a great job in curating excellent tour guides as until now all there were all professional guides. Scheduling tours are also not a problem like in Context Learnng as they never overlap with each other's tours. It must be from a direction from the viewpal team or the cooperation of the guides!
In any case, I strongly recommend both, but I am inclined more to Viewpal as I can take photographs and it's free to join! I have no connection with any of these companies. I am just a happy traveler!