9ft ceiling too low for cassette unless it's net height? 10 ft minimum so that when plaster 1ft there's 9ft of net ceiling height. For 9ft after plaster net 8ft left. Ideal is 11ft ceiling height.

Is dining and kitchen combined also or separated by a wall and door? Is this landed or condo? Use this post as a guideline. You may need two wall mounted split units. At least 2.5hp in living and at least 1.5hp in dining assuming living room is about 60% of the space.  More if factors suggest higher cooling load required.

Ceiling needs to be minimum 11ft otherwise after installation, it would be too low. If that is not an issue, if the space for placement such that it's strategically cool all sides without looking ugly fugly should be ok as long as you feel that you can do without ceiling fans. For a price of a 3HP ceiling, 2x2HP single split can be bought also.

You know your layout better so if it's two separate zones, this will be better else a single 3.0HP can do also.

Btw, unless your place is corner unit, a single 2.5HP should be adequate. Go through the heat load calculation. Usually ground floor uses lower heat load factor unless certain conditions are met e.g. facing these direction:W,SW,S; corner unit; no deep porch or verendah; no garden...ie fully paved driveway. Then the heat will be conducted inwards from the ground and reradiated from the floor. Similarly no porch means the heat absorbed by the wall will also reradiate inwards.

Unless an openable partition dividing dining and living area is installed you need to add the dining (13' 7" x 14' 2.25") to the living (21'x22.625'). This space is actually one large room divided into two areas/spaces: living and dining. The stairwell 21'x4.625' needs to be included as they are adjoining spaces also.  Thus sizing is predicate upon a closer approximation of the whole space. If there is something like a W or accordion top hung track partition that can be closed, yes you can just take into account of 21x22.625' (minus the lopped off corner outside the entrance). Let's take approximately 660sqft.

Taking an optimistic to conservative calculation
660 sqft x 60 = 39,600BTU/hr = 4HP
660 sqft x 65 = 42,900BTU/hr = 4.5HP

Also, this does not take into account of the heat from the downlight's ballast or driver. If we tweak the heat load higher:
660 sqft x 70 = 46,200BTU/hr = 4.5-5.0HP

If budget is a constraint, a 2.5 to 3HP will render the room barely cool enough (27°C to 25°C) if not cold (25°C and below). Any colder is beyond the power of the AC to cool on hot afternoons except on cloudy days after rain.

Mine is slightly bigger than your house with one Mitsubishi 2.5hp. Ac installed. Cold enough for the entire ground floor i.e. living, dining and kitchen. Temp setting 26c-27c.
Please take note that the outdoor unit is pretty big and heavy. Around 60kg.

Mitsubishi Heavy Industries FDT71CR-S is spec is rated at 24,225BTU/hr (7.1kW).

The Daikin FCN30F spec mated with RN30C is 30,000BTU/hr (8.79kW)

If greater cooling capacity is your priority, the choice is clear. Check the price at Lazada, could be cheaper.