The house is an decent area of Queens and with bus (Q18 to Astoria) and the sub (7 from Woodside 61 St) you get in about half an hour directly to Time Square. Becareful to take the express and if you are staying longer than 2/3 days buy the one week MTA card for 34$. Acrosse the street is also an grocery store calle Deli which offers priceworthy groceries and everything you need else. Coffee there is quite inexpensive. The overall hygiene is fine and the kitchen is quite big and offers a lot of free to use spices, which makes it great for cooking.
I am sure you will have a great time at David's place. He is a really nice guy so don't heistate to call him for about anything you should not be content with.