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1) It might seem exciting and fun but keep in mind that you are not married. There is no commitment involved. You both are just sharing a room and space. When you both live with someone you are not married to, your level of commitment to the relationship is not at its full potential. So even if you end up marrying this person, the longer you've stayed in this uncommitted mind-set, the more likely it is to stick.
2) Be ready to compromise. There will be adjustment problems. Your partner might do certain things that drive you crazy. And they will not change it just because you are there so you better get used to it.
3) You both will be financially independent but money matters will be a sore subject. Be clear with your partner from the beginning how you want to settle this and deal with it. The best option would be if you both go dutch.
4) You might feel a lack of private space when you both start living in because when you were used to being alone and on your own, now you have