I don’t know about your area but in the US it’s generally not a good idea to buy one bedroom flat/condo/house. Those are really hard to sell. If you have 2/3 bedrooms even if it’s as small as one bedroom it’s better to get that.

My realtor told me that throughout his career he has been having troubles selling people’s one bedroom places. If you want/can only afford a small place, then get a small place but with two rooms even if tiny. I wonder if this relative pushes an apartment on you because he has hard time selling it