Hi ogounn,
Prices range from 250KD to 1000KD for nice liveable apartments 3-4 bedroom apartments in some nice areas, some can already be furnished. Not sure about houses, have a look at: justlanded.com
Otherwise nice town plenty of shopping, prices are reasonable for general items, and compared with other Gulf states its quite cheaper here in some ways.
Its getting hot 40C already, 50C+ soon.
Don't know much about United Aviation except: they are the the second airline to be awarded AOC by the DGCA in the 50 years since Kuwait Airways was first certified.
See you round here one day,