Perfect location, just a block from the north end of the Zocalo (archeological site and cathedral). Not large and the walls aren't great sound barriers if there are some noisy neighbors, but it has everything you need. Small but functional kitchen, wifi (though it has its moments of aloofness). Probably best for 1-2 people.
Any less than ideal factors of the space really are made up for by the convenience of the location. The Zocalo metro/underground stop is 2 blocks away and has machines to buy a fare card that can be reloaded. One can get within walking distance to most places on this network - plus it's quite fast, though there can be quick or jerky braking from time to time.
Normally, most or all seats are taken aside from very offpeak hours, but with 25-27million people living/working in the city most days, it sort of goes with the territory. In other words, expect to stand. But I never waited more than 10min. for a train at any stop, and that was just once out of a month. Usually it's 5min. or less and you can get to most points of interest within an hour, including the walking and waiting.
Almost certainly better than braving their traffic and very cheap, only 5 pesos each time entering a new station. Well marked, easy to use. Also, it has a police presence at every platform, usually two or more on each platform.
In fact, in general there are police stationed at very public points all across the city. People are often friendly with them, asking for directions and local information. So long as you don't venture far beyond the city center it feels quite safe because they are present near most places of interest. Speaking of which, if you are an art enthusiast, there's so very much to see.
Most museums offer a free day of the week, so do your research. For a few that may not apply to foreigners or there is a different price for foreigners. The Frida Kahlo house is the most expensive by far and tickets currently have to be bought online due to pandemic policy.
Likewise, some government buildings have been closed to tourists, such as the National Palace (Diego Rivera murals) and Supreme Court (Rafael Cauduro murals - if you like art and haven't heard of him, look him up). However, the offices for the Secretary(iat) of Public Education have three floors of Diego Rivera murals and did allow access free. Happy Travels!