Hi,
We booked a private Gaudi tour in Barcelona for mid August, but the company also offers free walking tours. We will definitely sign up for the free walking tour of the Gothic Quarter, which lasts about 2.5 hours. There are 4 of us in our group - for both the private Gaudi tour and the free walking tour. Please share your thoughts on what we should tip. There is a lot of variance on the internet, ranging from 5-50 euros/pp with the most commonly sited between 10-20 euros/pp. I'm just curious what current travelers on this forum suggests, as I've received some excellent help and advice in the past. Thanks!