We stayed at Jo-Jo and Jo's for a weekend, mainly because it is close to the O2, where we visited a show on Saturday evening. The check-in was not complicated at all, we got a very quick response via the app with all the check-in instructions and we had a very warm welcome by Jo-Jo when we arrived at the house. She showed us our bedroom and bathroom on the 2nd floor which are clean and cozy - we felt very comfortable during our stay.
We always got in and out of the house whenever we wanted with our own key and it was no problem, if we arrived late in the evening.
Jo-Jo gave us some recommendations for pubs and places to have breakfast (A farm in the middle of London where you can pet some goats right after having breakfast! Can you believe that?). We actually crossed paths with Sir Ian McKellen on our way to the O2 right in front of his pub on Narrow St (btw... the pub was also a recommendation from Jo-Jo).
If you have the chance to stay at this beautiful home, go for it! :)