A couple more ideas I had/want to also agree with;
1) Window Boxes (and gardening in general) are a much needed thing for, at the very least, apartments, and here is why. Small houses can have an outdoor garden which allows them to grow eight crops, medium houses have double that at sixteen, and large houses have a whopping triple at twenty-four, but wait, there's more. Inside the houses themselves you can have two, three, and four flower pots respectively, which you can still use to at least grow crops you desire (not just flowers, and obviously not for cross breeding). So this means that their actual number comes out to ten, eighteen, and twenty-six.
Now, how many crop spaces do Apartments, the only thing many of us can even purchase at the moment to call something our home, hold. Two. Only two flower pots, and nothing else, which makes it so that a great deal of players are not only stuck with small yields for their day to day gardening, but also can never cross breed. That's huge, because while a seemingly small part of the garden at first, it actually locks a load of fun and content out from the player, forcing them to either not grow crops or buy them from the market board.
Window Boxes would be a step in the right direction, as they allow even us peasants who can only obtain an apartment to still partake in this small aspect of the game. The size of the Window Box should be appropriate in relation to other houses, which means they should be either three or four crop plots. Three would be in a straight line along the window, four would be a square and slightly more compact against the window OR two separate Window Boxes with two crop plots each. This would allow for cross breeding to still take place, just in a very limited capacity. If this were to be added I and many other players would be grateful and overcome with joy.
2) Though not a necessity, especially since we have a moogle downstairs who is happy to deliver and send our letters, an in-apartment mailbox would be nice.
3) But what we really could use, and this is a general housing item altogether, is a place-able market board furnishing, so that we can conduct our merchant business from the comfort of our own homes. I'm sure I'm not the only one who wants this and I think it is well deserved, we spend a lot of time decorating our houses and chambers, but more often than not I find myself standing outside my apartment so that I can use the market board as well.
that sums up my additional ideas, will add more when I think of some, hope you all add some more too!
tl;dr read only the bold parts.