The First Doctor: It's like living with your grandfather, judgmental and grumpy, but he sees love on the wing, lets Craig have some alone time with Sophie, and tells him he'll come back one day, yes, he'll come back...
The Second Doctor: Waking Craig up at all hours of the night with his recorder, making an absolute mess of his room, and wondering why his flat mate is wearing pants. Splits his own while trying to play football.
The Third Doctor: "My dear chap, this refrigerator is absolutely empty of all nutritional and gastronomical value!" At least Craig doesn't have to worry about getting car rides to places; the Doctor is more than obliging. But those UNIT parties have got to stop.
The Fourth Doctor: "This is a very nice flat, probably." About the same on the eccentricity-meter, but doesn't notice the shy love affair brewing in his midst. Keeps turning down the heat because he's dying under all that wool.
The Fifth Doctor: Hopes Craig's pub league is cricket, and sorry Craig and Sophie, ABSOLUTELY NO HANKY PANKY IN THE FLAT!!!
The Seventh Doctor: Prepared the note in the window and the old uncle's convenient will some time in a previous incarnation and is only now getting to it.
The Eighth Doctor: The note in the window is the only clue as to his identity, because he's caught amnesia again. Accidentally kisses Sophie, but it all works out in the end.
The War Doctor: The house is a secret front of the Time War, and the Black TARDIS a terrible weapon developed by a time sensitive race wanting to get in on the action. Walks in, gets things done, doesn't get involved in Craig's personal life. Maybe Craig doesn't get out of this alive.
The Tenth Doctor: Puts his foot in it about Craig and Sophie. And kisses her. And shouts at way more of Craig's clients. He's sorry, so sorry. On the bright side, the comic strip teaches us he's good at football too.