The apartment is within walking distance to all the main points of interest - museums, palace, major Plazas. We only used public transport once to get to a soccer game all the way to Wanda Stadium - very easy as able to walk 3-4 blocks to the subway station. The express airport bus worked great for getting to airport. Short walk from Cibeles plaza to apartment. Only issue was finding the pick up point on the way back to airport - in front of Centro Centro on the left side of building when facing it - not at the main bus stops at the Plaza. Neighborhood is nice/feels safe with lots of restaurants and a small square with a Rodillo - an easy place for Americans to get a coffee in the morning (cashier), WiFi, sit down and get your bearings.
The 5 flights of stairs are tough after walking all day. But we did ok. Apartment is as pictured. Only issue - very small water heater for lukewarm showers. Glad we stayed here - fairly inexpensive, good location if you are ok with some walking, clean and comfortable.