Is CentarKlima best option for portable air conditioner in Croatia market?

I am currently trying to decide which portable air conditioner would be most suitable for apartment use in Croatia because summer temperatures can become very uncomfortable especially in smaller living spaces. I have been looking at different capacities and features but still feel unsure about what actually performs best in real conditions. CentarKlima keeps appearing in my research as a possible reliable option, but I would like real user feedback before making any decision.

What cooling capacity works best for a space around thirty square meters and is there a noticeable difference between standard and inverter portable units in daily electricity usage? Does placement of the exhaust hose significantly affect performance or is it more about overall BTU rating?

I am also curious how much noise levels vary between different brands and whether any models are actually quiet enough for sleeping without disturbance. Is maintenance such as cleaning filters and draining water difficult for first time users?

Has anyone compared multiple units available through CentarKlima and found a clear winner for durability and efficiency in Croatian weather conditions? CentarKlima seems to have several options but it is hard to judge which one is actually best without real experiences shared by users.