I met Jean (Catia's husband) who gave me the key and attentively provided me with the help to ensure the comfort of my stay.
The studio or annex (back garden cubicle/conservatory) was rather charming. It is small but surprisingly functional. The shower room/toilet was tiny but adequate with good ventilation and reliable hot water supply.
The bed was a cosy double with a handy study table/chair at the foot of the bed. It has a smaller outer enclosed space for the washing machine and a hot plate. The flat screen TV functioned just fine as well as the free wifi.
The only downside was not having a proper window to let the cool air in as it could be very very hot in the summer.
This quiet accommodation should be more than adequate for a single occupant who wants an (extremely) affordable and rather safe stay around Croydon-Mitcham area as the transport link (Tram) was brilliantly just a short walk away. Getting to the Wimbledon/Croydon and the Centre (from west-end) was fairly easy.
Overall it was a positive experience, Catia and her kind husband went extra miles to make it a very comfortable and pleasant stay.