Hi, we have an apartment in Nerja which we rent out. We get the tenants to email their details i.e. passports when they book. we then email them to our agents/cleaning company who take a form to the tenants, get them to sign it and then take the completed form, passports etc to the Guardia Civil.
They obviously make a small charge for this.
One important note to remember is that sofa beds in living rooms a not allowed, bedrooms have to be bedrooms, in the good old days you could say 2 bedrooms, sleeps 6. Not any more.
Do not forget your complaints book and signs.
I hope this helps as well