His approach centred on the veduta, or topographical view. Vasi used a precise method to capture the city, often employing multiple perspective points to fit large structures onto a single page. His work, such as the Panorama van de stad Rome, avoided the fantasy of the capriccio in favour of architectural clarity. He focused on the physical reality of the streets and ancient monuments. These etchings functioned as souvenirs for British patrons who wanted to bring a piece of the Roman experience back to their homes.

Modern collectors value these prints for their clean lines and historical accuracy. The monochrome etchings provide a sense of order and classical balance that suits contemporary interiors. Unlike more abstract works, Vasi's views of The Campo Vaccino or the Mausoleum van de Plauzi familie offer a visual record of a specific moment. They provide a clear view of history. The large scale of his panoramas makes them effective for wall displays where architectural detail is appreciated.