1

Wjole at Lisbon, be sure to go out to Sintra. Its a mind blower!
Only an hour west by train.

have fun, not schedules.

2

I would cross Viseu out of that list without a moment's hesitation. For starters, due to crappy weather (just checked it now, +11C maximum and +3C at night and its only gonna get worse) and secondly due there not being much at all.

2 days in Coimbra may or may not be interesting. Probably not. I've never found anything to do there for more than 5-6 hours.

Overall, I can tell you this - I have lived in Portugal for several years and I have traveled around in winter and spring. The weather is really not that nice, especially in the north, and I found myself moving around and from place to place pretty darn quickly. If I were you I would either stay more in Lisbon area or add a few more places to the itinerary to make it more interesting.

3

Skip Viseu and Tomar, just because public transport costs time and energy.
Get lost in Lisbon and Porto. I love both cities and surroundings. Porto is even easier to walk around if you like walking, sites are close to each other. Also lots of local cheap restaurants to eat great lunches and diners.
The monuments aren't the only thing to experience. just wander around streets in the old parts of the cities,eat some wander some more, drink some. Depends on the weather and how you like the spots.
.2 years ago january was 2 weeks rain every day, last year was dry and 17 degrees celsius in lisbon.
You see Coimbra (train stop between lisbon and porto) in one day but I also like to walk around in the old streets there. it's as if time stood still.

4

Thanks for all your helpful advises!

What do you think about Guimarães instead of Viseu?

5

Hi I would definitely choose guimaraes above viseu, but I would research how easy it is to get there with public transportation. The urban areas in portugal are all well conected by public buses or trains. Getting to the out of the track areas may cost some more time but is also doable.
another city which is interesting is evora but is in another direction. It's a small city, but the biggest in the area with roman ruins and very old fashion. Not far from there elvas is another small town build in the walls of a fort to defend from enemies in the middle ages. Another nice place but direction south is alcacer do sal.
Note: this are all out of the way places for most tourists, but they might give you a nice feeling of peace looking how people go around and how all is quiet. Mostly I choose the spring and summer or autumn to go around as I like to enjoy the sun. In the winter as I said earlier the weather can be tricky, but if you are used to northern Europe you can handle it.
Maybe you want to write a report about your travel afterwards, with information about transport and places to stay.
I wish you a good time.

6

Google "Dream on Coimbra hostel" .there is a page on Facebook . 2 young women of 30, friends for 20 years lost their jobs and decided to start this hostel together about a year ago. They have a 2 person room. Have a look and contact them if it looks something for you. This people being locals can also give you nice ideas for your stay and things to do around the city.
Airbnb.com is also a way to stay with locals on a rented room and get a feeling of the local life. Just do a search on the site and the cities you are interested and you might find a profile and a room that fits your taste. You can always rent for a night and if you like it ask the people if you can stay longer.