It is possible that you have infested the flat by bringing fleas in on your clothing, so assuming it is fleas, do all the hoovering as above answer, then most importantly, EMPTY YOUR HOOVER STRAIGHT INTO THE BIN OUTSIDE, as they will find their way out again. You say you have wooden floors, this not good news from a Pest Controllers point of view, as wood is not a good medium for holding the chemical required to kill the fleas, but it can still be done.
I would recommend employing the services of a pest controller for the treatment for a few reasons!
1) His work will be guaranteed (make sure it is) so if treatment fails, he will need to re-treat it free of charge.
2) A pest controller will use chemicals far more effective against fleas and less toxic to humans, some of these flea treatments I use for this purpose is less toxic than table salt, once it is dry!
3) A pest controller, will no how to treat the property, none of this rubbish about just spraying the edges of the room and the bedding, that don't work.
4) He will be responsible for the welfare of persons in the flat and will give you expert advice.
I am a pest controller