rental price increase

My friend's lease just ended. He is in Palermo and was renting for 2 years. He paid 1 year up front and then had to pay another year and that just ended. The rents here always go up but what is a fair price to pay? Owner wants to raise the rent 40% of what he was paying. Which seems crazy...

Record rentals: prices in CABA increased almost 900% in just over three years Infobae Source: https://www.infobae.com/economia/2023/10/14/alquileres-record-los-precios-en-caba-aumentaron-casi-900-en-poco-mas-de-tres-anos/ October 14, 2023 This is stated in a report that measured the...