First of all you will not be able to go to a mortgage broker and get a 100% mortgage, they simply don't exist and the on;y way to get these is to select a property where the bank are offering 100% - even 110% mortgages on certain developments and properties
For thise mortgages the banks can be difficult and often take a long time to agree the terms, lots of checks, the interest rates can be higher than normal terms and they will ask you to agree some extra insurances like life and property insurance, so be careful
Remember the buying charges, which are not always included and it costs between 10% - 12% in fees and taxes, then you have to facture in not just fixtures and fittings but the charges for example for things like the setting up of the utility supplies
If you must have a 110% plus mortgage to initally buy a property think very carefully, you also have annual fees, rates, non-residents tax and community fees, somthing like €900 a year
I can advise on some banks that are offering 100% morthahes in the Murcia, please PM he for details