It was really good (but we stayed in a more expensive hotel than we usually would cos of lockdown bargain, so that helped).
Good vibe. We stayed in Playa de Las Americas and popped over to Los Christianos. Most seafront places open and pretty busy. If you go back into town it is quieter (about 1 in 10 places open) but enough bars and restaurants to find some life if you want it. Footy bars (Leonardo's etc.) open... although that won't be an issue for you... we had a dozen chirping Leeds fans just behind us when we watched Everton game but good natured stuff). We with young family so didn't hit 'nightlife' but all seemed to be getting lively from midnight-ish.
Folk seem genuinely pleased to see tourists (and I'm usually sceptical of over friendly employees). Good deals most places. We got a fantastic whale / dolphin cruise for bargain price even though only 18 allowed on boat instead of usual 40 odd (although tbf we tipped pretty heavily as service was so good).
Everywhere we went seemed relaxed, about 1 in 50 wearing masks just out and about (and in bars, restaurants, etc.). Shops and supermarkets request masks and most staff wear them in most places, although even within one week this was becoming more relaxed. I know the general tone on here and elsewhere seems to be one of 'safety first' and the tourists here (lots of Spanish, Germans and Scandis) are almost by definition a more relaxed bunch about CV, but to me it's been refreshing to be among people who are getting on with life and having fun. Kids adored the pools in our hotel, dozens of em having a great time and not a mask in sight. I think they are safe.