A home with no stairs can be as luxurious as one with many floors. It depends on the design and the materials used to construct and finish the home.

Scope of work would benefit from consulting an architect.

Mohammad. I understand your program. You may be lost in the details at the moment. Please do follow and trust the advice given here by all these people. You are about to embark on a reasonably expensive journey. Get professional help with someone who you can sit down at a table and brainstorm with them your ideas and intentions. There are Architects and there are professional building designers who are members of the American Institute of Building Design (AIBD) who are well versed in projects such as yours. I personally love a design challenge. After 38 years designing homes and special use buildings I enjoy this type of challenge the most. I am in Ohio and may not be close to where you are but I am sure with a little investigation you will find the best design professional for you.

The kitchen sink should go towards the corner next to the stove area since the plumbing would be easier due to the bathroom pipeline on that wall. The stove should be moved from there to the basin area but more central. I couldn't zoom in but what is loft above. Anyway, I think you could get rid of that wall and make it a half wall, and include a counter with 2 -3 bar chairs like for quick meals. Puja area, I think would be better elsewhere since there is non-veg food and sometimes alcohol consumption. You could have more like a partition shelf wall between dining and living, need to think more on moving the puja area somewhere else. Also, since the common bathroom is right there, you would not need another basin next to the dining area, its just not a good sight . You could mail me the floor plan and we could work on it more elaborately, but this is simply a skimmed review of the layout. Hope I was helpful .