Dear Tancredi & Paloma,
I believe you conducted a very interesting and enganging workshop.
All parts worked quite well and you manage to engage your participants.
I think that the quantitification for, the personal mapping worked quite well and got the participants to relate in a personal manner.
The translation of an personal map on to the geogrpahical space of the city map it is both an interesting and challanging one. However the participants were a bit lost. Perhaps they could be introduced to possible approaches to translante onto map. But more important, it is important, that you ask yourself why are you asking for this translation? What do you expect from it?