I rented the Lieutenant's Apartment for a week.
They call it a studio, but it's actually a one-bedroom - I was pleasantly surprised!
There's a separate bedroom, living room with 2 chairs, bathroom (with a washing machne!), and a kitchen that is fully stocked with almost everything you'd need.The refrigerator is a nice size, as is the separate freezer. There's a microwave, stove, oven, a dishwasher, kettle, coffee pot + filters, plates, glasses, etc. It's a better kitchen than my own!
The location is just across a small street (almost an alley, really, very common in Gamla Stan) from the main hotel.
The subway (Tunnelbana) is a short walk down the street (maybe 3 blocks at most), and everything in Gamla Stan is right there.