Just present all the documents that will somehow prove your "strong ties to the Philippines", even if you feel it isn't strong. If you want to go to Germany and its nearby European neighboring countries (all very nice), then you'll have to at least try applying. Just be ready to present a good case.
Your certificate of employment and approved leave from the company will help since it indicates the date you will return for work. Bank accounts and other assets such as property (you said "don't have much property" so there's a bit, right?) will really help also.
Your friend's formal obligation will help as well. It was a big factor in my first Schengen visa application, which I lodged at the French Embassy (I am single also). I showed the attestation d'accueil, which my French host secured from their municipal hall in Paris.
Hope this helps and good luck!