Apartment For A Month

Hey everyone, I realize its 230am in the land of Thailand, but maybe I'll get a helpfull answer Anyways I'm taking my first trip to Thailand in October (for a month) and was just curious as to what the best way to go about getting an apartment for the month would be. I am going to be staying in Bangkok the entire time. I am a single, 21 yr old male if that helps. As far as cost....really not an issue, lets say $700 for the month max. What areas in Bangkok would you recommend? I will be going out pretty much every night so that is important. Should I just land in Bangkok, then worry about getting a place or should I pay/book it in advance? Thank you everyone for sharing your knowledge with me and have an excellent day!