This place is a perfect stay for either a few days or a longer period of time. We stayed for 4 days, and the apartment is perfectly clean, it is very well located (metro takes about 15 min from Alvik to T-Centralen) and it is a very well balance of price/quality. Its location just a couple of streets from the metro and very close to a groceries store, a coffee shop/deli, a pharmacy and a couple of pizza and casual food places makes it even more appealing.
The host is absolutely lovely, very responsive (literally within a few minutes) and provided with everything we needed in advance. The apartment is equipped with all supplies (there's even a couple of hairdryers and a hair straightener), kitchen supplies and, of course, bed and bathroom linen.
I would recommend this place 100% and we'll be sure to come back in summertime.