the flat is located on the fourth floor without a lift with the building located between the streets of diputació and comte d'urgell, just 100 metres from gran via, one of the most famous avenues of the city.

How would the previous sentence be correctly capitalized?
The flat is located on the fourth floor without a lift with the building located between the streets of Diputació and Comte d'Urgell, just 100 metres from Gran Via, one of the most famous avenues of the city.