You can never go wrong with any of Taylan's places. We've stayed with him for the 2nd time and I know we'll keep returning.
The Ion Square house has a great location. There's a bus stop few steps away that takes you to Waterloo and London Bridge (Liverpool Street station), especially during the weekend bus lines are really fast (but mind the summer detours).
House is in the middle of bustling weekend markets and bars, restaurants etc., there are two grocery stores nearby (Co-op and Sainsbury's) so basically everything is in reach.
The room itself was great, overlooking the park and totally quiet. Taylan is always available if there are any kind of problems. Amenities are fantastic, everything is clean, and it basically feels like home away from home.
We'll def be back at Taylan's again :)