Ermita is in Manila.
Taxis from Manila International Airport will cost you a poverty-inducing 550PHP if you insist on taking an 'official' airport taxi. Non-'official', metered taxis are also legitimate and can be had just by walking away from the airport a bit. As with the ride from the domestic airport, barring severe traffic, a trip to Ermita should not cost more than 200PHP
Kamayan, 523 Merchant Bldg., Padre Faura St., +632-528-1723 to 24. Kamayan literally means to eat with your hands in Filipino. Their native buffet has a wide range of Filipino food to offer for just under 10 US$/person. Specialties include the lechon (suckling pig) and grilled seafood. Kamayan also has branches in Makati and Quezon City and is usually located.