I recently stumbled upon a great deal for budget travelers planning to stay in Amsterdam for (probably) a week or longer. There's a multi-location Dutch chain called "The Social Hub". The Amsterdam outpost just east of the Amstel is the only one I've seen. It's quite large. I gather students are a large part of its target market, so it has some excess capacity outside the school year. Much of the clientele is youngish, but noise was never an issue; perhaps I was tucked away in a quiet area. The website text says there's a discount for stays of two weeks or longer, but I got below-€100-per-night rates for two separate one-week stays this summer, booking directly. Regular rates are considerably higher.
I had an extremely small single room with ensuite bath that looked like a dorm room (albeit a new dorm room). I commend to your attention the reviews on booking.com, which do a pretty good job of highlighting what you get and don't get for the bargain price. There are larger rooms, but I don't know anything about them or whether their rates are good. The rooms are serviced daily if you want that.
There is no mini-fridge, but there is a branch of a local coffee shop in the lobby for purchase of things like sodas and sandwiches. I returned to the hotel after 8 PM every day, and the shop was closed at that point. However, there's a large Alfred Hejn supermarket about a 2-block walk away. I believe it's open till 10 PM daily.
The hotel is located between the north and south entrances of the Wibautstraat Metro station. There are up escalators at both entrances, but they were not always working. There's an elevator at the north entrance which worked when I needed it to, on my departure day. That Metro line runs up to Centraal Station.
Multiple Jewish-history/Holocaust sites are within about a 30-minute walk north of the hotel, as is the Resistance Museum. The Wereldmuseum is a bit closer. The De Pijp district (restaurants and bars) is across the Amstel to the west, not far away. Continuing in that direction one can walk to the Rijskmuseum, Van Gogh Museum and Stedelijk Museum in about 45 minutes (Google timing). In all cases public transportation can be used to reduce the amount of walking required.
There are restaurants in the neighborhood on the hotel's side of the Amstel if you don't want to go as far as De Pijp. I never tried them. I did stop two or three times at a good whole-grain bakery 2 or 3 blocks north of the hotel. It's called "Hartog's". You'll likely encounter a line--always a good sign.
The key negative aspect of staying at the Social Hub during the summer is that the place doesn't have real air conditioning; it has "climate control". It's an individually controllable ventilation system with (it seems) no chiller involved. The windows open (I don't remember how wide). During my August week there were three days with highs of 86F. I was outside the hotel while the temps were above 80F. If I'd had real a/c, I'd probably have used it to lower the temperature of the room by a couple of (F) degrees, but I wasn't uncomfortable. I didn't bother to open the window. I think there may have been a fan in the room, but I didn't use it. During a real heat wave, I imagine things would have been more iffy. For me, the very low room rates make it worth the risk for budget travelers.
Another thing to be aware of is that this isn't the kind of place where you mosey up to the front desk and chew the fat with the staff, asking for hotel recommendations and the like. There is no front desk as such; there are 2 or 3 round tables in the lobby where you check in, and there is usually--possible always--at least one employee out there, but I don't think you'd get a lot of support for things other than checking in and out. I had trouble with the Venetian blinds (which I hadn't used in many, many decades), and it took 90 minutes to get someone up to the room.