Holá Victor,
gracias por su interesa. Mi espanol no seria sufficiente para explicar todo, por eso va a continuar en inglés:
First thing you should know, is: We are not the company, which offers free walking tours. We do bike tours, which are the best way to explore Berlin, but not "for free", sorry.
Right now we are off-season, which means we can't promise the start of our daily tours, because often the no. of guests we need for a start isn't given.
If you are interested in doing an English guided tour (Spanish we just offer during the summer-season sometimes) on tomorrow's Friday, please contact us from 9.00 am in the morning to check, whether we've got somethin on offer or not.
For free walking tours check out the online offers of various companies I'm not allowed to name here.
Enjoy your stay in Berlin!
Best,
Robert
