Sybille's studio is a very beautiful, cozy and well located place. Everything is very clean and tidy. The heater works perfectly, although the control is at Sybille's house. She and her family are also very friendly people. When we arrived to the studio she had kindly leave us some fruit, bread and milk for the next day breakfast.
It's just 7 minutes walking from the nearest underground station (Russell Square) and two supermarkets. Wifi works well although the router is placed upstairs and sometimes the intensity of the signal is not very high. All the electrical appliance (washer machine, dishwasher, oven, TV) works perfectly and are new. The bath is well equipped. In general everything is very new, since the building (built in the 1790s) has been refurbished recently. Sybille and her family live just above the studio, so they are usually available if you need anything. In some moments you will hear her young children little feet dancing upstairs, but this is only occasionally.
We would definitely come back the next time in London.