Subletting of a rental object, either partly or fully, is essentially permitted under Swiss law. The landlord may only refuse permission for a sublet in the following cases:
The landlord's consent must be obtained before a sublet. Since properties on intermediation platforms like Airbnb are often only sublet for a short time and to changing guests, it is recommended that you request general consent for this type of subletting from the landlord.
The main information you must pass on to the landlord when subletting is the rental charge. The simplest way for the tenant to keep the landlord informed is generally to forward him/her the planned Airbnb entry.
Conditions are regarded as unacceptable in particular if the subletting charge the tenant is demanding is excessive. A modest premium is of course allowed since the Airbnb host is usually offering the rental property as fully furnished and is taking care of cleaning and supplying fresh bedding and towels. At the same time, the property may not be sublet commercially.
In short: If subletting an apartment or house results in a profit, the landlord can demand surrender of the corresponding amount.
The landlord suffers considerable disadvantages when, for example,
In cases of this sort, the landlord is entitled to refuse or withdraw his/her consent to sublet.
In February 2017, the Rental Court in Zurich decided that a tenant could no longer offer his apartment on booking platforms because he had breached the subletting rules. Moreover, he had to surrender the profit he had made to the landlord.
For operators of hotels and guest houses, collecting tourist tax for each night stayed is standard procedure in many municipalities. Since intermediation platforms increasingly represent competition to the traditional hotel business, some municipalities have modified their regulations: They now require Airbnb hosts too to collect tourist tax from their guests. The tax is often combined with a ticket for the local public transportation system, clearly offering added value for the guest. It's certainly worth your while to obtain the corresponding information from your local municipality.