Yes,they are two steets.
Londres: It´s London in Spanish
Ignacio Allende was a captain of the Spanish Army in Mexico who came to sympathize with the Mexican independence movement.
Londres esquina Allende, it´s the address of "La casa Azul" (The blue House).
This building was the birthplace of Kahlo and is also the home where she grew up, lived with her husband Diego Rivera for a number of years, and eventually died, in one of the rooms on the upper floor. In 1958, Diego Rivera donated the home and its contents in order to turn it into a museum in Frida's honor.