Is he the type of person that would have a mezuzah on his door? Is that nicer than the one he has? If the answer to both question is yes, go for it. If the answer to the first question is yes and the second is, "Well, he has one that's as nice but it would be more special coming from me" then go for it. I don't think you can go wrong so long as it's something that would fit him as an individual.
I have my own apartment but I'm almost always at my girlfriend's apartment. Men can light the candles. It is customary for a female to light the candles but in the absence of a female, a male can. My gf happens to like lighting candles. Even though her family never observed Shabbat that's I think still something that she connects with on some level. It's the actual observances of the day that she's not used to. It's hard for her to slow down. edit: And my parents don't really observe Shabbos though since their shul got a new rabbi my dad's been going on saturday mornings.
Do you live alone or with your gf? or with family? Hope not too personal. Like if you live with your girlfriend do you go to your parents for shabbat? because the start/kindle of candles and first blessing is done by the woman of the house right?
Thanks. Shavua tov is what you'd say after Shabbos. Don't have too much planned. Still warming my girlfriend up to the idea of observing Shabbos. Will probably take myself to shul Sat morning if I'm not too tired and read a little about Shabbos with her at some point tonight.