Everything was perfect. We didn't have the chance to meet Jonathan due to our different schedules, but he made everything easy for us. He sent us the key and all the useful informations, and welcomed us with toffees, beer and wine !
The appartment is 5 minutes away from the Brixton underground station, which operates all night on Friday and Saturday, and two steps away from Brixton village.
The appartment itself is amazing, I highly recommend it !
Thanks again Jonathan !