Looking for a single room in London

I am a professional female, age 34, Indian, single. I work as an IT consultant in central London with PricewaterhouseCoopers. I am looking for a single/double room accommodation (preferably ensuite), and my budget per month is 500-550. Due to the current situation I am working from home, so would need a place where there is good wifi. My new project is until 30-Sep, (with a possible extension), but would not like to sign a contract of more than 2 months.
I am very neat and tidy, I have a stable job and will pay rent on time.