Attic conversions vs adding bedroom

[Kevin King]

Just purchased a home in the LA area and I will be living here for about a year or so before moving out and renting it to someone else. While I live here, I want to make some small renovations to increase the value of the home and to be able to charge more rent. 

My question is, generally speaking where would the budget be spent the best for increasing the value of the home and increasing rent? Remodeled kitchen, convert the attic space into a bedroom / office, or adding an additional bedroom (there is plenty of room to add one decent size bedroom). 

The attic space was lived in by the prior owners years ago, and finishing this conversion seems to be the easiest (DIY) and lowest hanging fruit to me, but I'm not sure.

Thanks!