Looking for an apartment in Prague

I am Nathan from the Netherlands. I will be studying in Prague for 6 moths at the Charles University. I am 30 year old and studying History. I am looking for an apartment in Prague. Preferably in Prague 7, but other districts are fine as well. It would be great if it is not to far from the city centre. If the place is really nice I am willing to pay a bit more then 400 euro. But if I can find something around 400 euro’s it would be perfect. A studio is also fine for me. It doesn’t necessarily have to be a big apartment, as long as the location and the apartment are nice. I will be staying in Prague from the 13thof September 2015 till the 12thof February 2016. Next week (25thof August) I will be in Prague to do some viewings, so I could come over and have a look at the place. As you have seen I am a bit older then the average Erasmus student. This means I am not coming to Prague to party and living the student life. I am coming to study, and so I will take great care of the place I live in for those months.

 Thanks in advance,

Nathan