Accommodation on L visa

I am British and my wife is Indonesian. I will be on an F type and in provided private furnished accommodation in Beijing from 8 May to 26 June. I already have mine for this. My wife plans to join me on an L type from 15 to 26 June. As she isn't staying in a hotel, she won't have a hotel reservation to show. So what to do? Will a private address be acceptable? Or should I ask my Chinese sponsor to prepare an invitation letter for my wife?