Boarded Ryanair from Spain heading to Stanstead (uk), when we boarded we was instructed to not sit in the far right corner of the plan due to a passenger of the previous flight had vomited there. Fair due's we thought as we are sure that a cleaner would come and clean it before we take off..... As the plane got even more packed the temperature of the cabin grew and with this the vomit smell got stronger and lead its way down the plan so that everyone on board could smell it. When I asked if there would be a cleaner that would clean the seats before take off I was told that ALL airport cleaners where busy so it will be cleaned once we land back in the UK. Need I say more! Poor is not the word