Dovahneii is a fairly large city that connects to High Hrothgar, that is in the shape of the Skyrim Dragon Logo. The Jarl is the Dragonborn himself, the housecarl Delphine, and the court wizard Esbern, all of them residing in the capital building, Dragon Tower. Dovahneii is surrounded by a wall like Solitude and Whiterun that must go into it's respective town area.
Dovahneii's areas are mostly connected by bridges for easier transportation. It's inn is called the "Bane of Black", which is most likely a reference to Alduin. A player home, called Dragonbirch, is also there, somewhere in the east "wing" part. The city is divided into 3 "branches", which are:
Wing Branch: Where most of the houses are located
Tail Branch: Where the entrance, a few houses and the inn is
Head Branch: Where the main and important buildings and Dragon Tower is
Dragon Tower is the main building of Dovahneii, where the Dragonborn, it's Jarl is. It is like Dragonsreach, but it has many differences, like a High Hrothgar-style design (like all other buildings in Dovahneii) and a courtyard where the High Hrothgar courtyard used to be.
As mentioned above, the wall design of buildings is exactly the same way High Hrothgar is, although some other building designs have been changed (e.g. in Dragonbirch where the design is like the one in Sky Haven Temple)