How much money would we need (my girlfriend and I) as a foreign tourist to stay a week in Baguio city, near burnham park?

Please exclude flight costs and bus fare into Baguio from the Manilla airport. Just lodging, food, and in city transportation.

I suppose depending on where you re staying (I suggest you get lodging with Airbnb, it's much cheaper than staying at a hotel sometimes, but be mindful of security measures where you re staying) you d need about 150 to 400 USD for a week s lodging, and 50 USD a day for everything else. Though you could also work on much lower if you re trying to keep on a low budget.

Things in the Philippines are quite cheap compared to other countries. Though some locals may try to cheat you and demand a higher price if you look like a foreigner/rich person (which over there's essentially the same for most)

Lodging in a decent place will cost roughly $40 per night
food can be $15 per day
Taxi rides is the most expensive but also the safest at about $8 per trip