Try asian mansion or prince plaza on dela rosa, legaspi village. Had a 1-bedroom at asian mansion before, fully furnished for 20k so studio should be less than that. My friend lives in Salcedo though, I'll ask her how much it is. Oh, and another friend's brother got a studio at C. Palanca in Legaspi for 15k I think. Just go around the area and ask around :) Good luck!