I got mine via resortalia. Same insurer as the buildings insurance so makes things easier if you ever have to claim. No squabbling between insurance companies.
It's with Mapfre. The details can be obtained from Resortalia. An overview appears in the weekly newsletters as follows:
CONTENTS INSURANCE FOR YOUR PROPERTY FROM 103,88 EUROS PER 12.000 € CAPITAL INSURED PER YEAR
Are you interested on a full home insurance with leader Spanish Insurance Company (MAPFRE) from 103,88 Euros per year per 12.000 euros of insured capital? Due to the fact that the Insurance of the General Community is with MAPFRE (Leader Insurance Company in Spain), they can offer these fantastic conditions for the insurance of your property. Please contact us on tlt@resortalia.com in order to have further details about the prices they could offer you.
I took out 23,500€ furnishings cover for 111€. This also has other cover such as civil liability, legal defence etc. I'm happy to share my policy documents. If you want me to send them, PM me your email address.