Valencia rental agencies/sites

Hello to Valencia Community
I checked the housing posts but saw very little in the way of rental information.  I know there are many rental agencies and sites online but want to get a review from the community.  Has anyone used an agency or site to find long term rental housing in Valencia and had great success?  I am looking for a 1-2 bedroom, furnished apartment for 1 yr (possibly longer) starting in Aug 2018.  I will be living solo and would like to find a unit for under 600 euros. 
I will be moving to Valencia at that time so any suggestions for: agencies, online sites; neighborhoods... would be greatly appreciated.
Thank you

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