We spent two weeks in this apartment (flat D) in June 2022. We had a good time there. The apartment is clean and big enough for two people. The location is great, with lots of restaurants and cafes around, at a 10-min walk from King's Cross station, from where you can easily go anywhere in London. The apartment also has a kitchen with utensils for cooking. Communication was smooth and we got the check-in and wifi information a day in advance. The apartment is quiet so we had a comfortable sleep.
A few things to keep in mind:
1. The apartment is on the third floor, so you'd need to climb more than 60 stairs to get there. No big problem for us because our luggage wasn't heavy, but my mother had to pause for a few moments in the middle to regain her breath.
2. Make sure to have a sim card with available data. The wifi stopped working on the last night of our stay, and we had no way to tell the host about it.
3. The apartment has no air conditioner, so you'd need to open windows to reduce the summer heat, and there are no screens so flies may come inside when you do this.
4. Be ready to buy your own shampoo and handwashing liquid, as what's already there can cover only one or two showers.
5. The system in the shower for controlling the water temperature is not great. So often you'll have water that's too cold or too hot when showering.