We stayed 3 nights at Bårstua; it was warm, quiet, very clean, with private bathroom and kitchen with all the cooking facilities.
We asked to the owner if he can pick up us at the airport when we arrived (at 11 p.m.) but he couldn't..anyway it was close to the airport, and we took a taxi (10 minutes, 12 € ca.).
It's close to Alta Sentrum (where you can find supermarkets and some places to eat); it is also not far from the Rock carvings (about 5 km: we went by foot following the cycle path...but there is also a bus that can take you there).
There are a lot of nice walks in Alta, most of wich near the guesthouse! (i.e. Komsa Toppen, from where you can see the beautiful Altafjorden)
On the third day we had to return to the airport for pick up the car at the car rental, and we went by foot (30 min trough the wood).
We definitely enjoyed Alta and our stay at Bårstua!