Shanshan's place has 2 bedrooms, one that faces the front of the house and the other that faces the back of the house; because of that, both bedrooms have windows that face small patio areas, which is a nice and unique bonus! We went during an insanely cold week, so we couldn't really lounge in the patios, but if I ever stay here again I like that there's an option to lounge outside in 2 private areas.
My maps sent me down a strange path, which made the place hard to find. The best path is to go down Lamb's Passage from Bunhill Rd and Shanshan's building is right where Lamb's Passage makes a 90 degree turn to the left. Once you see it, it's easy to find.
Shanshan met us at our planned time and we had a nice chat. She's very amicable and we talked about a lot of things. She loves theater, has her own business, and has lived in many cities in the world. We had 3 people staying in 2 bedrooms and she was very nice to give us 3 sets of keys (especially because we all had different schedules). I also potentially had a friend who was going to crash and Shanshan was ok with that (because it was within our 4-person stay), and she even left extra bedding and instructions for my friend to use the sofa bed in the living room. My friend ended up not making it, but if he had, the living room has its own door, so he would have even had privacy there. Ie, you can technically have 3 private rooms there if necessary.
The place was very clean and well stocked with towels and bedding. The water pressure in the shower was a little weak, but manageable. London was freezing during the week we were there and Shanshan's booklet of instructions explained very clearly how to turn on the heat. The kitchen / eating area where you enter is quite big and has a full fridge and freezers. The kitchen also has a washing machine (but no dryer). Wifi instructions were also clear in the booklet and the wifi worked well.
The location is amazing! We were a block from the Barbican, which can't be beat. + We were above a super market, close to the co-operative market on Old Street, and surrounded by tons of shops and restaurants. We were very very close to multiple metro stations and the Liverpool Street Station (we mostly used Old Street Station) + tons of bus stops that take you all over town. If you like to walk like we do, 20-45 min walks can basically reach anywhere: Spitalfields market or SOHO. If you're coming from Gatwick Airport, getting to the flat only requires taking a quick ~30-min train to London Bridge and then just 3 stops on the Underground (Northern Line) from London Bridge to Old Street station.