There is one mosque in the city roughly a 5 minutes walk from the university.
Address: Pleven Center, bul. "Ruse" 13, 5800 Pleven, Bulgaria
There is an upstairs section for the sisters, which is accessed through the main entrance. No toilet facilities but wudu facilities for everyone present.
Jummah (friday prayer) begins at 1.30pm throughout the year.
The mosque has its’ own display which is the most accurate way of following the salah timetables.
However, by following this link you can also find an approximation, just make sure to change town to Pleven. https://www.grandmufti.bg/en/home-3/vremena-za-namaz.html
FAJR -1 min
DHUHR -2 mins
ASR -2 mins
MAGHRIB 0 mins
ISHA -1 min
These are the rough changes from the link times to the actual mosque times.