During the attack on Velaris , many of the homes of the residents were destroyed. In the aftermath of the destruction Rhysand explains to Feyre that many of the people fled to the country with family, or they died fighting for their home. One such family who lived along the Sidra, the river that winds through Velaris, found their house destroyed and left to live with relatives.
It is described as a manor house more than a town house by Nesta when she visits in the Epilogue of A Court of Frost and Starlight. The front entrance opens to a grand hall with winding staircases to the upper levels of the house. It is referenced that Feyre may have built a studio for herself, a training ring for the Illyrians, an office, a giant library for Amren, a garden for Elain, a master bedroom with a bath big enough for two, and a nursery. On the bottom floor there is a sitting room full of books, comfy chairs, and a fire place.
During this visit Nesta notes that the house is filled with paintings by Feyre. There are paintings of landscapes, scenes from the previous books, and the Inner Circle. Nesta notes that there is even a painting of her father and Elain. There isn't one of her though.
As a mating present to Nesta, Feyre gift her a portrait of Nesta holding the line at the Pass of Enalius. This portrait now hangs on the wall in the Grand Entry.