I had them in my place earlier this year while I was on Christmas leave. My OH worked away and bought them home from a motel that was right next door to a backpackers hostel. They are rampant in backpackers.
I didnt know what they were - I just saw the evidence in the morning and I was itching like mad. They never bit him AT ALL. So after some research on the net, I realised what they were. :(
All the cleaning and spraying did no good. In the end I wrapped the mattress in a plastic bag (fortunately my son worked in a shop that sold mattresses and he bought the plastic bag home) and then threw the bagged mattress in the back yard. The summer sun killed them all - and yes there was hundreds of them in the plastic bag. The mattress then went to the dump. After that I got a steamer and steamed the room from top to bottom and then called in the exterminator. After he had finished spraying, we bought a new bed - this time a proper bed, not an ensemble.
I am totally paranoid of them coming back. I dispise the creepy little critters. I have also invested in a mattress protector that keeps the bugs out, so if they ever come back, they wont be able to get in the mattress. The exterminator was amazed that they were in a private residence - he had never seen that before.
All up it cost me about $3000 to get rid of them and replace furniture. Not to mention that it totally ruined my leave as I was washing linen every day in boiling water, spraying the bed and the room, getting bitten to death every night, and I had to completely empty my wardrobe contents and wash and iron everything in it.
A thoroughly horrid experience I never wish to repeat. And OH does not work away any more.