It is interesting to note that Lisbon has the largest Christmas tree in all of Europe. It is a 26 story work of art that is breathtaking when lit up at night.
I have a fabulous restaurant to try if you make your way to this fascinating city:
Espaco Lisboa
R. da Cozinha Economica, No 16
Phone: +351 21 361 02 12
The temperature during the stay was very nice, typically high 50s each day and a few low 60s; very nice for December. If you are looking for an enchanting holiday experience then Lisbon during December will not disappoint.