Less well-known than his famous contemporary vedutistiCanaletto and Francesco Guardi, he was the son of an engraver. Prior to 1735, he was said to have been in Germany. Between 1735 and 1741 he was registered in the Venetian Fraglia de' Pittori, or painters' guild. One of Marieschi's sponsors at his wedding was Gaspare Diziani. Although he initially produced capricci (or fanciful paintings), he later went on to paint realistic vedute. One of his patrons was the noted collector Johann Matthias von der Schulenburg, who bought at least two canvases from the painter for 50 and 55 gold sequins respectively. Marieschi published a set of engravings of Venice, entitled Magnificentiores Selectioresque Urbis Venetiarum Prospectus, that represents his only work of certain attribution. It contains a portrait by Angelo Trevisani.