There are several options for parking:
about 50 meters from the house there is an underground parking called "Park san Giusto", on Teatro Romano street (via del Teatro Romano), the entrance is just next to the Old Roman Theater.
All along via del Teatro Romano there are several parking lots, they are free of charge from 08 pm to 08 am, then with a fee during the day (8am to 8pm). Weekends are free. These parking lots on the streets are marked by painted blue stripes.
Free of charge parking lots are available all along via di Donota (where the house is located) which leads from the Old Roman Theater to Trieste Castle and the San Giusto Cathedral. Several free of charge parking lots are also available in via del Collegio, just 30 meters from the house.
Free of charge parking lots are painted in white (white stripes).
Driving through via delle Monache (at the end of via di Donota) we also recommend to check out a little square on Cathedral street (via della Cattedrale) in front of the entrance of "baby Park". Plenty of parking options there as well.
Finally, all along the Castle and Cathedral area (on Capitolina street and San Giusto street) there are many parking lots, both paying parking 08am-08pm (blue stripes) and free of charge (white stripes).
From this area on the top of San Giusto hill the house is located about 100 meters away, and it's a beautiful little stroll all along the pictoresque and narrow streets of Old town Trieste, with great views over the sea and the city center.