My post here is a little bit late but I was actually trying to find how other PhD students are getting along and found this! An update would be good also if you are getting on ok! I see a lot of the users on here are, I guess ill give the other end of the experience (the bad end, uh oh!).
So I started in March and have never been at my university due to coronavirus. I have had a rough experience (considering dropping out and doing a masters), I was lucky that I got the offer (2 offers from different universities so even luckier!) but if I knew the experience would be the way it is I definitely would not have taken it up - but then again there was no way to know what my experience would be like if I hadn't accepted it - so go for it as I seem to be an outlier.
Downsides I have found - Isolation, mental health issues reoccurring that I haven't had in years (Work related I am always happy when im out with friends or family, 2 meter distancing of course), lack of motivation and drive, I generally find it extremely difficult to even want to work at home which is a personal problem of mines of course but some people may fall in the same bracket. Online meetings have generally been fine, However! I have now had my supervisor miss 7 meetings since coronavirus hit - not including ones he has been late to - but again this is a personal experience for me.
Just a little bit of my negative experience but they are mostly personal issues which have deterred me from wanting to continue, I think ill take a step back to masters and tackle the PhD sometime in the future - but good luck to you!