Hi, I think you should check a parallel forum thread entitled 'What is the regis up to now?' which is on a similar topic. My advice is always to involve a Swiss lawyer if you want to write a threatening letter asserting your rights with your landlord (if that's what you had in mind).

Legally, you're supposed to have all of the keys to the property. If the landlord has a set of keys and is entering on his/her own, there are a lot of legal consequences...

Thanks! I am not yet at the stage of threatening or taking legal action, just want to confirm that the law is on my side. The apartment I live in is attached to their house, but IS a seperate apartment and was presented to me as such before I moved in..

The answer is found in article 257h of the Swiss Code of obligations:

V. Duty of tolerance

1 The tenant or lessee must tolerate works intended to remedy defects in the object or to repair or prevent damage.

2 The tenant or lessee must permit the landlord or lessor to inspect the object to the extent required for maintenance, sale or future leasing.

3 The landlord or lessor must inform the tenant or lessee of works and inspections in good time and take all due account of the latter's interests when they are carried out; all claims of the tenant or lessee for reduction of the rent (Art. 259d) and for damages (Art. 259e) are reserved.

"in good time" means approximately 5 days. It can be 24h in advance for emergency situations or when the tenant seeks an early termination of the lease and the landlord must organize visits with candidates.