Hi! We're a party of 14 and we're travelling to Lisbon. Where can we rent a coaster/mini bus or vans for 4 days stay?
Do you want to drive yourselves or have a mini bus with a driver?
For a minibus including driver I would recommend Moor Viagens or Amiroad. I used both this past month and they were both reliable with English speaking drivers.
For 14 people it might be well worthwhile to have a driver. We were a family of 6 including a 1 year old and it was great to leave the driving to a professional who knew where to park etc. and allow everyone to really enjoy the trip.
Just one more point - parking can be a real pain in Lisbon. Public transportation is good in town. Again, I would recommend looking into a car service including a driver. Both of the companies I mentioned have 16 seater mini buses available I believe.
Amiroad
http://www.amiroad.pt/amiroad--luxury-transports--en.html
Moor Viagens
http://portugaltransfers.pt/