But I can see flat with 890 sq ft...

Still want to insist that apartment no pool ? Plenty of apartments with pools to prove you wrong. Kekeke

I should arrange a pool side party at my cheap apartment

british english = flat
american english = apartment

dictionary standard are same...just like USA call truck and ENGLAND call lorry

check the abbreviation below for better understanding
Flat = $$$$
Apartment = $$$$$$$$$
Condominium = $$$$$$$$$$$
Service Apartment = $$$$$$$ $$$$$$$$$
haha. ....

Apartment is the unit of your house. Condominium is the whole building (A collection of Apartments)

Flat is the unit of ur house too. Apartment can be the whole building i.e. a collection of flats ? LOL

So all in , flat = condominium ?

Thats why its more proper to say "my apartment building" or "that condo block" when referring to the building itself

One is rumahpangsa and the other is pangsapuri.

Whats the different between service apartment with Condominium then ?

service apartment always about 500-1000sf, and with the ''serviced'' title, normally means they charge u higher maintenance fees for sinking la , security la, and bla bla.
but for condo, there goes another type call service serviced condo for example ''Koi Prima'' , 1000-1500sf. their similarity is = partly furnished or fully furnished.

so, for i am thinking the difference between serviced apartment and condominium.
one is the money u pay is include the furniture and u have to bear higher maint fees.

the condo, is empty house when u move in, then have common facilities like swimming pool , bbq and so forth ~

Flat - not a single facility
Apartment - min swimming pool or shops
Condominium - sports facilities and clubs

Service Apartment vs Service Residence ?
Whats the different?

What it's called is less important than the actual living circumstances there.

go google to see the definition