I think this piece is quite lovely. It appears that your couch and chairs have dark wood so I would be tempted to stain or paint the buffet to match these items. Changing the large modern handles to smaller antique ones might help to make it less bulky looking and tie in with the other items in your room.. I like the idea of putting a mirror in the upper door, however much as I like the criss cross effect in the sample pictures, adding more detail may conflict with the curves in your sofa and chairs. You could look for a decorative detail that has more subtle style. As for placement, it might go on the short wall where you have a bench or even on the wall where you have your table with two chairs, one on each side to balance the look.

I faced the same issue when i brought a new house and had to use my old double door refrigerator. The refrigerator was white in colour but after 6 years of usage it turned yellow . I simply brought a 700 Rs decal sticker from aliexpress and voila its turns out really well for my house. Attached some pictures for your reference. Now talking about the almirah i would have painted it some bright neon colour or maybe matt black ( colour depending on what would look good in your house ) to make it the show stopper of the house. Good luck and post pictures once its done!!

you are thinking about the space right now. it looks odd, no doubt. 1) when you fill in with the furniture, just make sure the three steps are hidden. 2) consider three potted plants of different height, so the rectangle is complete. 3) glass bowl with Siamese fighting fish for each step 4) figurines of different heights 5) 2inch square wooden bar on each step up to the top of the rectangle. and complete the entire rectangle if you want with a smaller rectangle open in the center my suggestion is, there is a reason why this space ended up like this. it will look great once you put something there. things like these are what make your house unique.

Just leave it as it is apply a layer of matte varnish over the concrete ...if needed just add a plank of leather finished granite over the tread