How to display the weekly view in manage availability in rooms_availability? I installed the Rooms module, and enabled all dependencies. Now when I edit a bookable unit and when I click in "manage availability", I can edit availability per month. 

But I do not want a monthly view, I want weekly view. And I want to select the availability per hours/days.

Is that possible? And is there any other way to do this? Or is there another change in the code?
I'm not aware of a way to display a weekly view. But as per your "... is there another change in the code ...", it seems like it should be pretty forward to transform the 3 months view to a single month view via rooms_three_month_calendar.tpl.php.

To actually do so, remove line 2 (with class="month1") and line 4 (with class="month3") from this part of that tpl file:

&lt;div class="calendar-set clearfix"&gt;
  &lt;div id='calendar' class="month1"&gt;&lt;/div&gt;
  &lt;div id='calendar1' class="month2"&gt;&lt;/div&gt;
  &lt;div id='calendar2' class="month3"&gt;&lt;/div&gt;
&lt;/div&gt;


After doing so, it should look like so:

&lt;div class="calendar-set clearfix"&gt;
  &lt;div id='calendar1' class="month2"&gt;&lt;/div&gt;
&lt;/div&gt;


Still not exactly a weekly view, but at least you already got rid of 2/3 of the days you don't want to see, right? And hence leaves 3 times as much space for the current month view.

Note: By not removing the backward / current / forward links in that tpl file, you should still be able to easily navigate to another month.