My sister got married in this church, so I have rather fond memories of it. As other reviewers have mentioned, it is quite charming and the fact that it sits amidst the hustle and bustle of the city only highlights how quiet it is once you get inside the church. It isn't quite a tourist attraction yet but with the Philippines aggressively promoting itself as a tourist destination I expect that church built in the 1860s will soon have more foreign tourists visiting. The fact that it's relatively accessible via the MRT (maybe a 15 minute walk from the MRT Guadalupe station, though admittedly through some dodgy areas) is a plus, since public transit is mostly a pain in Metro Manila.
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