Below is a list of places you might want to consider with reasons why and approximate price for 1 bedroom apartment. Please remember that SF is a really small City, so in 15 to 30 min you can move from one end to another, either by car or by mass transit. Price include TICs.
South Beach ($600k, on the Bay, between Bay Bridge and Giants stadium)
Marina ($650k, as Megan mentioned in her answer)
South of Market ($470k, many restaurants, Sony center, etc.)
Inner Sunset ($750k, next to Golden Gate Park, plenty of cafes, restaurants)
Inner Mission ($250k, many experimental theatres, average price - $600k)
Mission Bay ($570k, up and coming place behind Giants stadium, on the Bay)
Mission Dolores ($340k, as Inner Mission).
Click on the link below. I have links to over 20 apartments (condos, lofts, TICs) all over City. Hope it helps.
I'm a real estate agent in SF, so I get to see alot of neighborhoods in alot of detail.
I really think you would like...and should consider NoPa (short for North Panhandle). Is the "hipsters" neighborhood and has everything you mentioned above. Very cool neighborhood for young single guy.
If you ever want to buy....
Zephyr Real Estate