Favorite thing: Daugavpils is a clean and friendly city although English is not universally spoken. It probably better to go in Summer - it can be very cold in winter - however it is unlikely that you will find very much to do unless you are keen on Churches or monuments.
In Daugavpils you can live a easy life, because there is nothing special to do.
The people are friendly and helpful, even when they do not speak english at all. Russian can help, since they are close to Russia.
They have some nice public parks to hang around and there is also the banks of the Daugava, the river.
The police was also helpful, since one of four policemen spoke good english.
It was not so easy to find the tourist office, but once found, you can get there necessary basic infos.
Fondest memory: The goats, browsing in a park. Incredible!