There are many people who have difficulty sleeping in a bright environment, including with natural light, so it is a good option to install blackout curtains in the bedrooms and living room, if necessary.

To ensure that your guests have a good night's sleep it is essential that they do not lack anything. Put at your disposal a curtain that ensures your privacy and allows any light to be sealed off for a perfect night's sleep.
The same applies to the living room, where there is often an extra bed, or a sofa bed.
Like rugs, curtains are an excellent way to add color without touching the walls.
If you increase the area of curtains to cover an entire wall, which is possible with a reduced investment, you can build a wall with multiple panels that you can use later in another space, together or separately.
Anything that results in greater convenience and privacy is always an asset for your Local Accommodation, remember that.
This issue of curtains is not just a decorative detail, the law itself requires the general requirements of a Local Accommodation.
Take this into account in your establishment!
Legislation
Law No. 62/2018 of 22 August - Approves the legal regime for the operation of local accommodation establishments
Article 12
General requirements
2 - The accommodation units of local accommodation establishments must:
c) Have a system that allows the entrance of outside light to be sealed;