living arrangements '10-'11

so i guess im living in the same place next year. landlady decreased the rent for me from 680 to 600. pretty awesome. everything included as always. i probably could ask if i could have someone move in with me though the place is meant for one[i dont think so?]. in that case i think she'd increase rent by 100 [just cause i asked before]so thatd be 700 between the both of us 350 per month? either that or she keeps the rent at 680 and adds 100 so...780 a month = 390/month for two people x] i hope itll be like that, now i gotta ask if thats possible. anyone intrested? this is an if btw if the landlady lets me :x