The problem with AirBnB for 1 month or more is that most listings are optimized for a few days stays.
So if a bedroom rents for 300 eur / month in long term, if occupancy is around 60%, The apartment will likely be >600 for short term.
What I usually do is look for listings with decent monthly discounts, and if none available then start negotiating for long term stays, clearly showing them that renting for 30 days will give them 100% occupancy and save A LOT of hassle from moving people in and out.
For even longer stays (3 months or more), because I usually look for bedrooms, I contact the hosts if they'd like a mid-term housemate and if they can make a fair (regular) price.
@johndbritton and @WanderingJo get a Revolut credit card, free transactions, free card, free withdraws (!!!), and at fair exchange rates.