Hi all - I asked this question of fodorites a month or so ago and have been doing a lot of research since.

I thought I would post what I have found on here in case anyone else every finds themselves planning a beach vacation to Europe for 20 people!

Obviously I can't vouch for the quality of any of these villas. Our group is in the process of voting on which one to choose for our June 2007 trip.

All of these sleep 16-28 people:

http://www.holidaylettings.co.uk/ren...jas-Costa/6216
http://www.lantisworld.com/villamilos.htm
http://www.holiday-rentals.co.uk/Spa...tea/p58471.htm
http://www.worldvacationrentals.net/detailed/1721.html
http://www.vacationvillas.net/Spain/...vea/p32521.htm
http://www.holidayvillasonline.co.uk/index2.html
http://www.holidaylets.net/prop_detail.asp?id=4932
http://www.holidaylets.net/prop_detail.asp?id=2851
http://www.holidaybank.co.uk/propert...ductID_e_66531
http://www.holidaylets.net/properties/5026
http://www.villaplus.com/code/villas...oom=9#Continue
http://www.holiday-rentals.co.uk/Ita...m?uni_id=27852
http://www.javeavillarentals.co.uk/palmview/index.html
http://www.villastogo.com/property.php?id=151
http://www.holidaylettings.co.uk/ren...sta-Calma/4087
http://www.villaplus.com/code/villas...&bedroom=8
http://www.holidaylettings.co.uk/rentals/Moraira/10398
http://www.luxury-private-villa-rent...lgarve-262.htm
http://www.holiday-rentals.co.uk/Spa...16714.htm#desc
http://www.homeaway.com/Spain/Alican...ni/1/p3222.htm
http://www.villarenters.com/advert_s...ue&unbrand

Almost forgot one:

http://www.alpha-omegaonline.com/Sma...%20Villa/e.htm

This one has some as well.

http://www.lhhfrance.com/index.asp

Bookmarking

Thank you so much for doing this research and sharing it with us. I am copying it for future reference.