Only if your tenancy agreement explicitly permits subletting. Most standard assured shorthold tenancy agreements prohibit subletting without the landlord's written consent. Listing your flat on Airbnb without permission is a breach of your tenancy agreement and could result in eviction. If you want to short-let your flat, you need written consent from your landlord before listing. Once you have consent, the standard London 90-night rule applies. Letting a spare room in your home while you remain in the property is different and may be permitted under your tenancy agreement.