where is this piece of property? you will need to contact a local architect to help you. most municipalities have front and back yard setback rules as well as side yard rules. you have not indicated what is considered the front or back of the property. without knowing more details, it is impossible to offer you a meaningful comment.

SInce it is a compact apartment as most apartments are, having minimal decor with maximum storage will do best justice to the flat. U can have a storage cum visual space seperator which keeps the drawing room seperate from the private areas. The bedrooms can also be kept simple with storage beds, having sliding wardrobes with mirrors which gives a feeling of space. the kitchen also can be kept simple sleek with few highlights.

if required a wooden pergola can be added attached to the staircase mumty on left side but it should not exceed from the height of mumty. It will complete the elevation. Also if you love planters then put some creepers and hanging lights over the wooden pergola.

If you like to keep the traditional look, bring in curtains, paintings and more lights. Repainting the walls will be a good idea as it can create more freshness. Try a feature wall with red or maroon paint or wallpaper that compliment the flooring. The book shelf can be changed to something wooden. Or If you want a contemporary look, choose wall mounted / floating book shelves.