Manila is a big city. Everything can be considered expensive compared to other part of Philippines. But if you know your way around here than you'll be fine. The public transportations are still in poor condition. Traffic is bad and some places are not that tourist friendly. Just need to prepared for any possibilities. Tour or excursion available mostly on weekend and in big group.
Insider Tip:If you want to use the LRT or MRT, travel early. The Q for the tickets is like you're trying to get a ticket to a concert or boxing day shopping.People are friendly and high chances they are able to speak English. When haggling price make sure it is well deal. They might ask for more later. Stand your price. Keep enough change, pay and walk away.