Wemmick's house is a tiny, cozy little cottage, with unique quirks that make it seem almost like a ship that has landed on shore and made a permanent residence. He refers to it as "the Castle," and indeed it has many castle-like properties to it, excepting any sense of largeness. It has barely enough room for people to be in it, but Wemmick loves it nonetheless. In it, he houses his aged father, who enjoys hearing the cannon go off every night at nine. Wemmick keeps many gifts, tokens and remembrances from some of the cases that Jaggers has taken on over the years. Amongst the novelities that Wemmick has collected is, as he lists off,
"the pen whith which a celberated forgery had been committed, a distinguished razor or two, some locks of hair, and several manuscript confessions."
These novelties give Wemmick great pleasure, and he even wears some rings and jewelry given to him by criminals themselves.
Jagger's house is large, but, as Pip notes, looking like it has seen better days. On the outside, he mentions that it is "dolefully in want of painting" and that the windows were dirty. Inside, the main description that he gives for the house, over and over, is "dark." Plus, there tons of rooms, but Jaggers only uses a few of them; so, the house is much too large for his needs. He makes good money though, so he can afford such a large house. The furniture is functional but not fancy, and he doesn't keep valuables or silver in the house, challenging all that know him to even dare come rob him--to this end, he never locks the doors. No one dares rob him though, and the house is safe.
I hope that those thoughts helped a bit; good luck!