Homesharing appears to have been invented independently in Switzerland, mainly to support a growing student population.  We are aware of the following programmes

Fribourg www.croix-rouge-fr.ch/de/dienst-und-hilfe/wohnen-helfen

Geneva

www.unige.ch/batiment/division/service-batiments/prestations/loger/#d

St Gallen www.intergeneration.ch/de/projekte/benewohnen 

Rolle – Ensemble Avec Toit covers the French-speaking areas of the country, see www.ensembleavectoit.com/

Zurich – Pro Senectute Kanton Zürich

http://pszh.ch/soziales-und-beratung/wohnen/generationenuebergreifende-wohnpartnerschaften/