This manga feels kind of amateurish to me. Is this the artist's first work? The compositions and dialogue are flat and cliché and the somewhat awkward posing and anatomy really exacerbate these problems. The characters also have left no impression on me other than boring or even annoying. The ex-homeless girl just lazing around makes the situation feel exploitative to me (@Cogito, I get what you're saying but she could still help out with the dishes, come on). It might even make her an interesting character if the author took it a step further and revealed that she's been intentionally "seducing" the MC to take advantage of her, but I really doubt they'll go that route; which is a shame, because her just being oblivious and super-friendly is uninteresting.
The fact that this is a drama which seems to be taking itself rather seriously makes these issues stand out all the more. I don't think I would care half as much if this were a light-hearted comedic series.