Hmm, well I checked the wiki and they all seem to take quite a few quests to get, except for Breezehome, which I refuse to buy. So does anyone know of a safe place for my items? A certain chest in the DB sanctuary? Somewhere in Jorrvaskr??
I haven't had any problem storing stuff in the TG Cistern. The chests in the circular Cistern room are relatively safe. But I wouldn't store anything in the TG vault or training room. I've seen people post about losing gear stored in here. So try using the Cistern room chests right next to those 2 beds at the entrance that leads to the Ragged Flagon.
If you're heading into the Ragged Flagon from the Cistern, your bed is the one on the immediate left (next to that sewer waterfall). Your chest is right next to this bed. The other chest is immediately across from your bed on the right side. I've always used those 2 chests to store carp loads of my stolen and owned loot without any issues. Also played the entire TG questline doing this without any problems.
The 100% safe route is to buy a house. And the cheapest house is the one in Whiterun for 5,000 gp. The two 2nd cheapest are in Riften and Markath for 8,000 gp each. Of the two of these, Riften has the easier access with one of the house doors being directly accessible from outside the city walls. A real nice perk if you've got a high bounty, carrying a lot of loot and not a TG member. That convenient entrance makes getting past the guards at the front gates a non issue.