My boyfriend and I stayed at Gilly's for 4 nights. She sent us a message when we made the reservation and seemed very warm and pleasant. She sent another message a couple of days before we arrived to get details of our check in time. She even offered to help with anything to do with our trip. I was worried about parking since we planned to rent a car for a few days. Gilly was very fast in her response and told us all the parking options available.
The place is really true to the photos. Very clean and a good size for 2 people. We were missing one of our luggage and Gilly stayed home to receive it when the airline dropped it off. And yes she does leave breakfast at your doorstep every morning!!!! She left a couple of bottles of wine in the fridge for us. She even checked up on us to make sure we were fine when the London Bridge attack happened since we were out that day.
The apartment is literally 1/2 minute walk to the bus stops. It's a central and safe location and you are very close to shops (Harrods, Tesco, Harvey Nichols etc). A bus ride to Victoria Station.
We are definitely using Gilly's next time we're in London!