Makati is safeish. The trouble is, that it looks and feels more Western than most Asian cities but it is really the least Western in terms of safety & stability. Greenbelt looks and feels very upscale. It is fun but don't scratch the surface.
If you are doing a 4/5* fine. But understand that the classifications are muddled & pricing like everything else in RP is what you negotiate.
I recommend the Ascott by miles. The Peninsular & Mandarin are OK but are both full of hookers & pricing and room quality very variable.
After that the rest of the 4/5's are really much of a muchness irrespective of official classification. If anything after that I'd recommend The Somerset Salcedo (Ascott chain) again) but don't get the wrong Somerset whatever you do (locals will get my point).
& wow a Brit Woman with a Filipino you have broken the mold on here! Just enjoy the place the people are wonderful. It is a fantastically pretty country other than stunningly ugly but fascinating Manilla - but the government & systems are shambolic.
Thanks for your advise, the Ascott looks great but seems abit out of my price range. I really like the look of the Somerset Salcedo, and the offers on their own website are amazing. I will definately be staying there if I go to Manila.