We have been three weeks in your appartment (4 people) . For a 3 or 4 days stay the appartment is correct but to spend 3 weeks the conditions of the appartment are not comfortable enough. For a mid-term stay we recommend to provide at least one extra towel and sheet per person to have at least the opportunity to wash and to change them. It can also be useful to have more cups, dishes and cutlery. Only 4 cups of coffee for 4 persons or 3 spoons are not enough.
Also to add a shower curtain in the main bathroom or to add space to put your clothes will be a plus.
On the other hand the area of the appartment is nice and quiet.