Once you are close to the old Trento city center, you have better park your car around. Given that you stay at some distance from the very center, there is plenty of space to park. If you do not find any parking space available, that means that you are too close! Drive a little further off!
Trento is not that large and you can visit almost everything by feet.
Mind, the map given by the Tourist Office is not very clear. It represents in the same way wide an avenue (not very wide anyway!) and a "vicolo" passage 1.50m wide!
What a great idea - in Trento you can hire bikes for free, between 6am and 8 pm to explore the town. Just follow the instructions on how to unlock and return (see second pic). Very trusting and I wonder if this system works in other towns and countries - let me know!
I used Trento as a center to sleep and travelled to cities like Bolzano, Verona, Venice, Padova, and even Florence from here. Italian trains, for the most part, are fairly punctual and convenient. The best part is they are cheap. All the cities I mentioned above (except Florence) costed no less than 10 euros one way on a regional train.
Trento is reached easily by train. It is just an hour of train ride from Verona and about 2 hours from Venice. The cost from Verona on a regional train is less than 5 euros per person and less than 8 euros from Venice.
Give Trento about half a day to visit.
The best mean of transportation to go to Trento is by car. This town is situated close to the free way so it's easy to find it.