Got a pointer x from the RSPCA 8 years ago. He and his brother were found in a high rise flat but they wouldn't let them go as a pair. They had trashed to joint.
Even after having dogs all my life, he is the best one yet. When he was younger he would run all day with the bike, and then want more when i got back!! He's slowing down now but can still do 10-15 miles.
As for being at left on his own, gf is a nurse and works shits so at most he has about 4 hours to kill. He has the radio left on for company. Only problem with him is he's a hair dropper!! And lots of it!!
As other people have said above, "try before you buy" as it were. They are alot of work and can stop you doing things if you get asked at very short notice but are worth their weight in gold!! Good luck