The host was very2 responsive / proactive / helpful. It is always negotiable with them.
The house also near from the Hyde Park and to those who love to go to the oxford street. Very near and easy to reach by public transport.
In the future, it is also good to know early which floor you are staying / offering. For example, family with kids are priority to the ground floor. Even the price would be difference but it helps.
Great host!