We had a great experience at Sarah's flat. The bus that takes you into the city is literally 30 seconds from her building. It's close to a few small supermarkets and a few bus stops from a big shopping centers. From the bus stop, you have access to the tube stations so you can get basically anywhere in the city. The place itself was really clean and nice. The kitchen had all the appliances we needed to cook for ourselves each night. My boyfriend and I stayed there and had plenty of room for the two of us. The bathroom was on the smaller side but was clean and it worked just fine for us.
Sarah herself was very helpful and nice too. We didn't get to meet her bc she had a train to catch, but she helped us figure out how to get to her place from the airport and dropped the keys for us at the supermarket across the road. The supermarket also had an atm although our American cards didn't work on it. We walked about 10-15 minutes to get to Barclays Bank to pull out cash.
Overall, we had a great stay and would recommend this place!