Paul is a friendly and reactive host. The flat is a basement flat but is however comfortable and quiet. The furniture, in particular the bed, is of good quality.
The neighbourhood appears to be gentrifying. I did not encounter any problem and there is regular police presence. Be aware distances in the US are vast and it is quite a walk to Union Station. Also be aware noise insulation between the basement and the house above could be better. Having said that I found my hosts were really considerate.
To summarise, an enjoyable stay and a good base to attend my meetings and sample Washington's many delights.