This is a great place to stay, and I highly recommend it!
I never communicated with Said, but his friend Hany was very responsive and helpful, and their friend Ali who checked us in was friendly. The flat is HUGE and in a really fantastic location with everything you need within one city block. It's halfway between two Tube stops which serve both the Piccadilly and Central Lines (Russell Square and Holborn), and a short walk to the West End theatre district, Covent Garden, The British Museum, Trafalgar Square, and many other London landmarks.
The appliances are great, especially the very large and modern stainless steel refrigerator, the washing machine (no dryer), and the dishwasher. There are two microwaves and one is broken, and the other one kept running after the cycle was done so we turned off the outlet when we weren't using it. There was a really great selection of glassware, including champagne flutes, wine glasses, beer glasses, and more! Also plenty of basics for cooking such as olive oil, salt and pepper, etc.
Note that the flat is on a very busy street that is noisy at all hours and the noise is loud, especially in the larger bedroom and living room if you crack the windows for air flow. We are heavy sleepers so it wasn't a big issue, but could definitely see how it might keep others awake.
The listing said there was a hot tub, but we were asked not to use it or the shower in one of the bathrooms because of pipe issues. The larger bathroom has a functional shower and a large bathtub, although note that if you are taller than about 6' 2" (about 187 cm) you will not be able to stand up all the way in the shower as the ceiling is pretty low. Also, we couldn't get the many jets and spickets shown in the pictures to work, although the single shower head that did work had good water pressure and temperature.
Plenty of towels, blankets, toilet paper, and other essentials were provided. Overall, a great place to stay!