The R-690 is not a cage I would recommend, its narrow, and awkward to get into to decorate or clean, the ramps are steep so not great for an aging rat. If you are going to get a good Martin's go for the R-680, powdercoated. . Its a much easier cage to decorate, clean, etc. I cannot get Martins shipped to Canada anymore but still have an R-680 here that I love.
R695, powder coated with flip top lid is a great cage …… cover full level with a piece of thick linoleum cut to fit and balconies with a dollar store dish drain tray cut to fit and attached with zip ties . Assemble cage using 100s of zip ties because the c-rings will rust