This accommodation was extremely high quality. Furnished to a very high standard and exquisite taste. Three adults (of same family) had plenty of space and privacy. The beds (mattresses) were really comfortable too. Just right. Not too hard or soft! There are 2 compact shower rooms and a kitchen which are perfectly adequate for short stays. The location was perfect! We stayed 5 nights and did a lot of walking (70km). We found the vaporetti seemed to take ages to make the journey from Ca' Doro to San Marco so mostly walked everywhere. Plenty of convenience stores (especially the Spar towards Ferrovia along Strada Nuova which is in an old cinema and has been restored beautifully).
Stefano was available via Whatsapp/text and we met up with him a few days into our stay. He is a very helpful host and told us about his apartment in Palazzo Smith Valmarana and its history.
Having stayed at various places in and around Venice I can say that this is without doubt the best of them.