Me and my family stayed at Ian's place over a weekend before we went on to another destination. The apartment was extremely clean and spacious. As there were 4 of us, my sister and her boyfriend took the bedroom while my mom and I slept on the sofa bed, which was surprisingly comfortable. Ian's place is about a 10 min walk to South Bank in one direction and another 10 min walk to the Victoria line tube diction in the other direction. It was very convenient for us and exactly what we needed.
If you do book with Ian, I would highly recommend reading the entire instruction page after the check in part as there is more information on wifi and what is around the neighborhood. In our rushed state, we only read the whole thing our second day in and missed some stuff.