A very positive experience! The apartment is clean, modern and well furnished. It has everything you need for a few days stay. However, sheets are not provided so you should think about bringing your own. In terms of equipment, everything worked. A European plug adapter is even provided. The apartment is more than enough for four people.
The hosts were very welcoming, friendly and warm. Communication was easy and pleasant. They were available for us throughout our stay. We did not experience any problem.
The apartment has a quiet neighborhood. It is a 5 minute walk from the underground, which is very convenient to get to central London (~20 minutes by metro).
Overall, everything went well. The apartment is as advertised. There's a very good value for money, the apartment is worth the price paid. I recommend this apartment and Mahafuj & Umar! Our stay was very pleasant. If you are staying in London for a few days, it is a very very good option.