Although we had an issue with neighbors' loud music at night (which Constantino said doesn't usually happen), we had a lovely stay overall thanks to his quick and kind help.
The location is amazing too. With two tube stations in 7-10 minute walking distance, you can go anywhere in central in about 30 minutes. We also liked there was a supermarket that's open until midnight at one of the stations.
The flat is filled with pictures and paintings of his family and give you a sense of home right away. The bed was very comfortable, too.
We're happy we stayed here.