How can I get an apartment in Tel Aviv (25 october - 20 december)? Is
it some websites I can use? What is the normal price there? I speak
only english.

Dear Kmmelhus, 

Here are several websites you can use. 

Listings
========
City Leases
<http://www.cityleases.com/spider/LEsearchSubmit.asp?areaname=Tel+Aviv%2DYafo&State=Israel&City=Tel+Aviv&Apt_Share=&Bedrooms=&l_term=st&Priceper=Week&Pricemin=0&Pricemax=1000%2B&fromstdate=&tostdate=&stdate=&Furnished=Yes&Pets=&bathrooms=&security=&parking=&doorman=&elevator=&laundry=&AirCondition=&creditapp=&Internet=&Rebate=&Sublets=&Summer=&advanced=&Holiday=&Site=cityleases&Rentaltype=>
(if this link doesn't work for you, here's another one: 
<http://www.cityleases.com/spider/LeSearch.asp?country=10&state=Israel>). 

Craig's List for Tel Aviv
<http://telaviv.craigslist.org/apa/> 


Private Holiday Rental/Short term lease companies
=================================================

Holiday2000 
<http://www.holiday2000.net/> (holiday apartments in Tel Aviv)

Suite Apartments - Close to Hilton Tel Aviv
<http://www.suite-apartments.co.il/HTMLs/Home.aspx> 

Kikar Dizingoff Apartments
<http://www.hotel-apt.com/> 

Ben Yehuda
<http://www.tel-aviv-rental.co.il/> 

Andromeda Hill
<http://www.inisrael.com/andromeda/index.html> 

Vrbo
<http://www.vrbo.com/68992> 

The White Dove
<http://personal.zahav.net.il/PersonalSite/no/noor/> 

Fuss
<http://www.fuss.co.il/> 

Korat
<http://www.korat.co.il/> 

babait
<http://www.babait1.com/> 

The Home
<http://www.thehome.co.il/> 

Arbel
<http://www.israelapartment.com/> 

Dekel
<http://www.dekel-holiday.co.il/> 

Eli's
<http://www.eli-telaviv.co.il/> 

Israel Real Estate
<http://www.israelrealestate.net/> 


If you're coming as a guest/student of Tel Aviv University:
========================================================== 
Tel Aviv University Housing
<http://www.tau.ac.il/visitors/housing.html> 

I hope this answers your question. Please contact me if you need any
clarification on this answer before you rate it.

Thank you for the tip.