Jason's place is very well located near Ximen station. The room itself is quite spacious, but only has one small window that looks out at another building. It was relatively clean, but the extra blanket that was on the bed had some hairs from previous guests in them. We didn't use the blanket at all though so it didn't bother us too much. The bed is comfortable enough, but really short. A taller person will probably not be able to stretch out.
The room has a hair dryer, washing machine, TV, water boiler, shampoo & body soap (no conditioner), and good Wi-Fi. Jason also provides two sets of body- and face towels.
We only met Jason briefly, but he seems like a very nice guy. He was responsive to messages and asked if everything was to our liking.
Overall, I can really recommend Jason's place. It's perhaps not the cheapest option available, but the room is spacious and very well located.