@ Maria...Traveling solo my accommodations are mainly small hotels and Pensionen. They are 2 or 3 star places, nothing fancy, extravagant, simple places. Sometimes staying in a hostel, either a private room or a 6 person co-ed dorm room, although the last couple of years I've not stayed in the hostel.
I am mainly a budget traveler, conservative with the expenses, and all that. Of course, I look for and take advantage of bargain rates, promo rates, etc. Of course, if I can get a 4 star hotel in the summer offering a 2 star rate for a single, I'll take it, as long as the other factors I consider are acceptable.
Under " normal" circumstances the location of the small hotel is top priority, unless that neighborhood is just too bad , safety-wise , etc for my tastes, but luckily I have not found that to be the case.
I mainly stay near the train station, ie, 1-6 min walk....Frankfurt, Munich, Hamburg, Kiel, Nürnberg, Düsseldorf, Minden, Lüneburg, Weimar, Dresden, Paris, Vienna, Metz, Strasbourg, London ( just across from Kings Cross), Berlin is the exception but I'm 4-5 mins from the Pension to the S-Bahn station that goes direct to Berlin Hbf (central station).
This way I don't have to rely on "wheels" to get me from there to the train station on departure day, especially if it's a 8 am train or earlier, or spend time looking for the hotel on arrival day. This saves on the rare taxi expense or having to rely on the bus or tram, or fighting the rush hour crowd in the subway with luggage in tow. I just walk over.
Staying small hotels, B&Bs (London), Pensionen enhances the chances usually at breakfast of talking and meeting other guests or with the hotel staff, etc. Usually a grocery store or two is close by, or the Post Office.
I did rent once, in Warsaw in 2001, prior to Airbnb. That was an apt in old town...very satisfactory, nice, etc., had to rely on a taxi to/fro the main train station. The Mrs handled all the details,... her choice, her call, I just followed.