These bloodsucking critters are an annoying nuisance. Once a house is infested it can be tough to get rid of them. I've gotten rid of them without engaging the services of costly pestbusters.
Insecticides are pretty useless so your weapon of choice would be heat & open field engagement.
You need not look all over the house for bedbugs as they generally nest near food source (which is you). They are attracted by body heat & carbon dioxide you breath out so you & your family members are practically 'bedbug magnets'.
They normally nests where you would be for prolonged periods of time (e.g. computer area, sofa, bed, etc). Bed bugs want to live near you, so you probably won't find them in your toilet unless you been there a lot .
So to deal with them, instead of trying to stay clear of them, welcome them to you. Steam your sofa/bed/chair/table/wardrobe every 2-3 days. In a few days you should see dramatic improvement but to get rid of them 100% will still take quite some time.
To kill as many crawling ones, use yourself as magnet by sitting on floor & read a book at night. On the ligths-it doesn't matter. Do a quick scan of the floor like after finish reading a page. Kill as many crawling ones as you can while they crawl over the exposed floor with tissue/toilet paper. You might still be bitten. Look around your clothes too as they probably take cover in your clothes after their blood feast.
Hunt & destroy their eggs(look at small rice beads) with hot water. Soak your pillow case, bedsheet etc in hot water. Object where many eggs are found can either be discarded to subject to hotwater treatment(soaking is best if can be done). Splash hotwater into small crevices to kill those hiding. Use a hotair blower to dry the area afterwards.
Spending a few hundred on pestbusters does not necessarily rid your house of those nasty critters. Approach i've used can achieve similar if not better results without blowing a hole in your wallet.