@Ingibjorg0, the five reviews you had in the past are very positive ones.
One thing I might suggest is that you take advantage of AirBnB's free offer of a professional photographer to take photos of your listing. The ones you currently have don't do the place justice at all.
I would also suggest that you put a Security Deposit in place.
You might also try limiting your minimum night stay, perhaps to 2 or 3 nights, just to see if it makes any difference. And offer a discount for a stay of 7 nights.
Another idea might be to change up the number of guests and the price. For instance, offer one price (for instance, €148) to accommodate 1-2 people, and indicate that the charge for each person after the second is, for example, €15 (thus bringing it up to €178 for 4 people). This could open up more interest.