Marriott Bonvoy rewards your loyalty by giving you half the points at Residence Inn and TownePlace Suites . As a Gold, you might not have much of a chance for an upgrade from a studio to a suite. RI seems to have moved the light dinner to Monday-Wednesday now. I did have some very good artisanal appetizers at a RI last winter, though. TPS seems to attract more families than what I normally see at a "free breakfast for everyone" property so the breakfast area gets overcrowded. I'll only stay at a RI on points and mostly avoid TPS.

Homewood Suites or a Hilton Garden Inn would be my choice. As a Diamond, your upgrade chances are much better. HS food options seem to be a little better than RI. HS has ceiling fans in the rooms which are a nice touch. At HGI you can choose a free breakfast for you and a guest as one of your benefit choices. Only Diamonds have this benefit so the breakfast area is more relaxed. All HGI properties should have a small fridge and microwave. Some of the suites in older properties are shotgun style where the sitting area doesn't have any windows, but the newer ones are much nicer and brighter.

Call around to a few properties and speak to the GM about an extended stay rate.