In Madrid, the most "popular" i would say is Sandeman's free tour(although, as you know, they do expect a tip)
as for the tip, there is no minimum, but the average tip given is around 10 euros, from my past experiences and reviews that i've read.
(I used sandeman's free tour in Dublin, and they were great!
There is also mymadridfreetours
www.mymadridfreetour.com/freetour_en.html although ive never heard of them, so im not sure how good they are.
In Toledo, the tourism office has a 2 tours for free check out the link below:
Hope this helps,
Thank you very much. It has been very informative!
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