For Next Friday and Saturday night
I used the site Momondo and found Quinta Colina by Shiadu for £58.
For Next Tuesday and Wednesday
I used Trivago and found the Turim Saldanha Hotel for £61.
For Friday and Saturday night, 3 months from now
I used Kayak and found Quinta Colina by Shiadu for £69
I was surprised at how cheap it currently is for a last minute weekend booking and how its more expensive the further in the future it is.