I must admit that I didn't go all the way to Eritrea in Feb 2020 to specifically visit this WHS though it would be impossible to miss once you are there since it encompasses pretty much the whole capital. It was my third trip to the region but first successful attempt at getting into the country so it had been a bit of a nagging personal goal for a while. I'm not familiar with the other major Art Deco hot spots so wasn't sure how appealing it would be to me personally but I quickly came to love the overall atmosphere of Asmara and very much enjoyed my time there. I'm not sure if it says more about me or the country but it is easily my favourite African capital.
The good news is the Eritrean system seems to have lost the harshest edge of its paranoia and my experience was overwhelmingly hassle free. The bad news is the number of dilapidated buildings has only continued to increase over the years. I used a guide book that was 12+ years old and found that while the buildings hadn't moved, several that were listed as visitable or in use had been shuttered completely and left to decay. The Fiat building is fenced off and empty now for example. I found this added to the trapped in time character of a country that has been isolated and undeveloped for so long. It was more like walking around a huge antique shop, far more akin to a Cuba without any tourists than to North Korea, to which is it normally (unfairly) compared.
The weather was perfect during my visit and I spent the better part of 2 days walking the city and enjoying at leisure. It is a excellent city for wandering, first with a purpose to find the most important buildings and then after simply for the joy of discovering hidden gems. There are numerous interesting cafes to rest and refresh scattered about also to reward the effort.