So, squeaky boards you can fix relatively easily by drilling a hole with a 10mm forstner bit (for a clean hole that will take a plug neatly), and then a pilot hole for the screw, screw into the joist, and then cut a plug from a scrap bit of floorboard, glue and tap in with a hammer, cut down and then sand flush. If you google cutting wood plugs, it should explain the idea.
It would be good to know if you have any cables or pipes under where you plan to screw down, and you need to be able to locate a joist.
Unfortunately, they have just been lazy with the gaps at the edge. You can usually sneak boards under the skirting and not leave much of a gap without removing the skirting at all. It is a fiddle and time consuming though - it caused me a lot of distress when I did mine tbh as taking the skirting off wasn't an option at all.
I think you're rightfully upset. The job isn't great, however I think there are strategies to minimise the things that irk you. Once you have chosen your finish (oil etc) and you know what colour it will be, you could get one of Bona's acrylic fillers to match the colour, which will be a lot less obvious to look at. Also, properly fitting some trim will completely hide the issue. It'll take time but it should be worth it. Amusingly I need to do something similar in my flat and I've still not gotten round to it several months later.
Also, when the guys come in to do the sanding and finishing, they should be able to help and advise.
Also, for the gap between doors - just get a threshold. You can get solid wood or metal. It's not the most elegant and there are probably better solutions but it will look neater than what's there already. It's not a million miles off how mine look tbf. As for the gap by the hearth, you do need a bit of a gap for expansion. You could get someone to carefully cut it square. Either with a multitool, or very carefully with a plunge saw. Then I'd just put some some of trim over it.
Edit: it's not a drama fest mate, don't fret. These things are stressful regardless - don't be too harsh on yourself!
So, squeaky boards you can fix relatively easily by drilling a hole with a 10mm forstner bit (for a clean hole that will take a plug neatly), and then a pilot hole for the screw, screw into the joist, and then cut a plug from a scrap bit of floorboard, glue and tap in with a hammer, cut down and then sand flush. If you google cutting wood plugs, it should explain the idea.
It would be good to know if you have any cables or pipes under where you plan to screw down, and you need to be able to locate a joist.
Unfortunately, they have just been lazy with the gaps at the edge. You can usually sneak boards under the skirting and not leave much of a gap without removing the skirting at all. It is a fiddle and time consuming though - it caused me a lot of distress when I did mine tbh as taking the skirting off wasn't an option at all.
I think you're rightfully upset. The job isn't great, however I think there are strategies to minimise the things that irk you. Once you have chosen your finish (oil etc) and you know what colour it will be, you could get one of Bona's acrylic fillers to match the colour, which will be a lot less obvious to look at. Also, properly fitting some trim will completely hide the issue. It'll take time but it should be worth it. Amusingly I need to do something similar in my flat and I've still not gotten round to it several months later.
Also, when the guys come in to do the sanding and finishing, they should be able to help and advise.
Also, for the gap between doors - just get a threshold. You can get solid wood or metal. It's not the most elegant and there are probably better solutions but it will look neater than what's there already. It's not a million miles off how mine look tbf. As for the gap by the hearth, you do need a bit of a gap for expansion. You could get someone to carefully cut it square. Either with a multitool, or very carefully with a plunge saw. Then I'd just put some some of trim over it.
Edit: it's not a drama fest mate, don't fret. These things are stressful regardless - don't be too harsh on yourself!
Bona filler:
https://www.wood-finishes-direct.com/product/bona-gap-master?gclid=CjwKCAiAv4n9BRA9EiwA30WNDyLjOnBv4PQZLxQIJzS_XwFcMU1pNhliI_6LGm5wByrhTkYrFO-lOxoCTDQQAvD_BwE